prabhanshubhowal/natural_language_to_linux

nl_command stringlengths 14 387	bash_code stringlengths 0 532
Check if a drive with UUID "09b8f1ab-8d4b-4c5f-b395-40be09c090b0" is mounted	mount \| grep $
Search the files in the current directory tree that are named "string to be searched" for "text"	find . -name "string to be searched" -exec grep "text" "{}" \;
Find and print the names of all files found in the current directory and all of its sub-directories	find . -print
display all the files in the current directory and do not search in the sub directories	find . -maxdepth 0 -print
Find all *.txt files/directories under current directory	find -name '*.txt'
Print the hexadecimal bytes and printable characters of "Hello world"	echo Hello world \| od -t x1 -t c
Find empty regular files in /dir and its subdirectories	find /dir -type f -size 0 -print
search for the text file "file.txt" and display its parent directory	cd /nfs/office/ && find . -name 'file.txt' \| sed -r 's\|(\./?).*\|\1\|'
Compress all .txt files in the current directory tree to archive "txt.zip"	find . -name '*.txt' \| xargs zip -9 txt.zip
Find all files/directories under $1 which have at least execute permission for their owner and set execute permission for group for these files/directories	find $1 -perm -u+x -exec chmod g+x {} \;
display all the files in the current folder excluding those which are in the path of ".git"	find . ! -path ".git" -type f -print
Search for regular files of the grooup 'users' in the file system	find / -type f -group users
Find all regular files in /usr/bin accessed more than 20 days ago	find /usr/bin -type f -atime +20
display all the files in the current folder	find . \| awk '{ print "FILE:" $0 }'
Format the time string $timestamp according to the format string "%Y-%m-%d %H:%M:%S" and save the output to variable 'CDATE'	CDATE=$( date -d @"$timestamp" +"%Y-%m-%d %H:%M:%S" )
find all the files in the folder /work which belong to the user "olivier"	find /work -user olivier -print
show the disk use of all the regular/normal files in the current folder which are bigger than 50MB	find . -type f -size +50000k \| xargs du -sh
Print the first line of each file under the home directory	find $HOME/. -name *.txt -exec head -n 1 -v {} \;
Join colon-separated information in 3 files LN.txt PH.txt and AD.txt in a cascade fashion: join LN.txt and PH.txt, then join the result with AD.txt	join -t':' < < \| join -t':' - <
display all the files ending with ".user" or beginning with "admin" or ending with ".user.gz" in /var/adm/logs/morelogs/ and excluding all regular files	find /var/adm/logs/morelogs/* -type f -prune \( -name "admin." -o -name ".user" -o -name "*.user.gz" \) -print
Search for "ifconfig" in the output of "history" and print 5 lines that precede and follow	history \| grep ifconfig -A5 -B5
A no-op on filename with sed	sed -i "s/\\\\\n//g" filename
find all the files in the folder /usr/bin which have been modified in the last 10 days	find /usr/bin -type f -mtime -10
Print a space separated list of numbers from 1 to 10 with no trailing new line	seq 10 \| xargs echo -n
Take a file path from standard input and remove it.	xargs -I '{}' rm '{}'
Show ls's detailed output for all files named "something"	find . -name something -exec ls -l {} \;
Change directory to the current user's home directory	cd /home/`whoami`
find regular files under the current directory, whose name ends in .mbox and rename each file, to the same name without .mbox at the end	find . -type f -wholename \*.mbox \| sed 's/\\.mbox/mv "\1.mbox" "\1"/' \| sh
Find files/directories that have no owner or group under /path	find /path -nouser -or -nogroup
Get the disk space used by all *.txt files/directories under /path directory	find /path -iname '*.txt' \| perl -lane '$sum += -s $_; END {print $sum}'
Copy all files in current directory that do not match /not-from-here/ in their paths to /dest	find . -type f -not -path '/not-from-here/' -exec cp '{}' '/dest/{}' \;
Remove the last 3 characters from 987654321, keeping only 987654	echo 987654321 \| rev \| cut -c 4- \| rev
Unzip all ".gz" files in the current directory tree excluding files containing "dvportgroups", "nsanity", "vcsupport", "viclient", and "vsantraces"	find . -name '.gz' ! -name 'dvportgroups' ! -name 'nsanity' ! -name 'vcsupport' ! -name 'viclient' ! -name 'vsantraces' -exec gunzip -vf {} \;
display the number of lines in all the header files in the current folder	find . -name "*.h" -print \| xargs wc -l
List all files in the current directory tree that were modified 60 minutes ago	find . -mmin 60 \| xargs '-rd\n' ls -l
Find all *.php files under current directory and change their permission to 640	chmod 640 $(find . -name *.php)
Move all files in "/path/subfolder" to "/path" without clobbering any destination files	find /path/subfolder -maxdepth 1 -type f -name '*' -exec mv -n {} /path \;
Set variable GZIP to the full path of command "gzip"	GZIP="$(which gzip)"
Get the total sizes of all files under current directory	find path -type f -printf '%s\n' \| awk '{sum += $1} END {print sum}'
Find every directory under "0001" and make new directories replacing "0001" with "0002" at the beginning of their names.	find 0001 -type d \| sed 's/^0001/0002/g' \| xargs mkdir
Returns the single most recent file in a directory	ls -t \| head -n1
Archive "./htmlguide" to "~/src/" with resolved symbolic links and delete any extraneous files from "~/src/" not found in "./htmlguide"	rsync -av --copy-dirlinks --delete ../htmlguide ~/src/
Recursively changes group ownership of everything within '/git/our_repos' to 'shared_group'.	chgrp -R shared_group /git/our_repos
Display users who are currently logged in	finger \| sed 's/^\ \ pts[^A-Z]\([^./\2\t\t\3/'
Run script $2 on remote host $1 using interpreter $INTERPRETER with pseudo-terminal allocation	cat $2 \| grep -v "#" \| ssh -t $1 $INTERPRETER
Print an octal dump of "file" with named characters, no addresses, and no suppressed duplicate lines with sections starting with "esc", "fs", "gs", or "us"	od -a -An -v file \| perl -0777ne 's/\n//g,print "$_\n " for /?(?:.)*/gs'
Recursively change owner to "$1" and group to "httpd" of all files in the current directory	chown -R $1:httpd *
Create a ssh key with no passphrase and store it in "outfile".	ssh-keygen -f outfile -N ''
Execute the first instance of "parallel" found in the PATH, passing it all parameters received by the script/function	`which parallel` "$@"
Gets IP address of ${NET_IF} network interface.	NET_IP=`ifconfig ${NET_IF} \| grep -Eo 'inet (addr:)?([0-9]\.){3}[0-9]' \| grep -Eo '([0-9]\.){3}[0-9]' \| grep -v '127.0.0.1'`
Display non-hidden files in the current directory with the given output format	find . -maxdepth 1 -name '[!.]*' -printf 'Name: %16f Size: %6s\n'
Changes group ownership of 'myprog' to 'groupb'.	chgrp groupb myprog
Find all the files in file system which are accessed 50 days back	find / -atime 50
Go to directory named "~" (not home directory)	cd "~"
Perform a dry run to recursively copy "test/a" to "test/dest" excluding "test/a/b/c/d"	rsync -nvraL test/a test/dest --exclude=a/b/c/d
Gives the primary group of $USERNAME.	groups $USERNAME \| cut -d\ -f 1
Recursively list all files on smbfs mounts	mount -v \| grep smbfs \| awk '{print $3}' \| xargs ls -lsR
Find directories starting from /TBD that were modified more than 1 day ago	find /TBD -mtime +1 -type d
See the word count of every *.txt file in the home directory	find ~/ -name '*.txt' -print0 \| xargs -0 wc -w
Create a symbolc link in the current directory to "target"	ln -s target
Gets MAC address of eth0 network interface.	ifconfig eth0 \| grep -Eoi [:0-9A-F:]{2}\{5}
Convert standard input into a dump of octal bytes without the first 8 bytes of address and count the unique results	od \| cut -b 8- \| xargs -n 1 \| sort \| uniq \| wc -l
Find all *.txt files under current directory and copy them to ./tmp	find . -type f -name '.txt' \| sed 's/'"'"'/\'"'"'/g' \| sed 's/./"&"/' \| xargs -I{} cp -v {} ./tmp/
Write "error" to standard output	echo "error" \| tee
Prints Kb size of all top-level files and folders in a current folder in descending order in human readable format.	du -ksh * \| sort -n -r
Find all *.foo files under current directory and print their contents	cat `find . -name '*.foo' -print`
Find files that are writable by the user, the group, or both under the plsql directory	find plsql -type f -perm /220 -exec ls -l {} \; 2>/dev/null
find all files in the current folder that have a single letter in their name and have not been modified today	find . -name \? -mtime +0
Find all files under 'dir' directory with white space safety in their paths and print their md5 sums into file.txt	find dir -type f -print0 \| xargs -0 md5sum >> file.txt
find the path of a specfic video file in the current directory	find ./ -name "foo.mp4" -printf "%h\n"
Split the sorted and unique lines in files "emails_*.txt" into files with at most 200 lines each with numeric suffixes of length 4	sort --unique emails_*.txt \| split --numeric-suffixes --lines=200 --suffix-length=4 --verbose
Search for files that were accessed less than 5 days ago.	find -atime -5
Join columns in "file1" and "file2" if their first field matches and format the output as a table	awk 'NR==FNR{m[$1]=$2" "$3; next} {print $0, m[$1]}' file2 file1 \| column -t
Check if "$file" contains DOS line endings	od -t x2 -N 1000 $file \| cut -c8- \| egrep -m1 -q ' 0d\| 0d\|0d$'
Find all directories under current directory and change their permission to 500	find . -type d -exec chmod 500 {} \;
Removes all files but $1 newest ones from current folder.	ls -tp \| grep -v '/' \| tail -n +"$1" \| xargs -I {} rm -- {}
Search in the current directory and all sub-directories except ./D and any further sub-directories also named D for the file named hi.dat	$ find . \( -name D -prune \) -o -name hi.dat
display the contents of all the files ending with ".fq" and perform a control check on this raw sequence of data and display the output to the screen	find . -name "*.fq" -exec cat '{}' ';' \| fastqc /dev/stdin
Find the files in the current directory that match pattern '.JUKEBOX..txt' and move them to folder ./JUKEBOX	find . -name '.JUKEBOX..txt' -maxdepth 1 -print0 \| xargs -0 -IFILE mv FILE ./JUKEBOX
Search for .bam files anywhere in the current directory recursively	find . -name "*.bam"
find all the files in the current folder which are bigger than 10MB and less than 50MB	find . -size +10M -size -50M -print
Search the CSS files found in the current directory tree for string "foo"	find . -name \*.css -print0 \| xargs -0 grep -nH foo
Decompress 'file.gz'	gzip -d file.gz
find all js files under the build direcotry except build/external and build/log directory.	find build -not \( -path build/external -prune \) -not \( -path build/blog -prune \) -name \*.js
Display the differences between "file1.cf" and "file2.cf" side-by-side with a width of 150 characters	diff -y -W 150 file1.cf file2.cf
Find only number of hard link & name of files from long list	find -type f -iname "*.txt" -exec ls -lrt {} \;\|awk -F' ' '{print $1 $2 $9}'
Find all user files larger than 5MB	find / -size +5000000c 2> /dev/null
Mount the directory "/etc" on "/tmp/sarnold/mount_point/"	mount -obind /etc /tmp/sarnold/mount_point/
create an archive using 7zhelper.sh as a compress program	tar -I 7zhelper.sh -cf OUTPUT_FILE.tar.7z paths_to_archive
Display all lines containing PROBES in the current kernel's compile-time config file.	grep PROBES /boot/config-$
Reversibly sorts content of the '${TMP}/${SCRIPT_NAME}.pid' file, comparing human readable numbers in file strings.	cat ${TMP}/${SCRIPT_NAME}.pid\|sort -rh;
Delete files in /var/tmp/stuff and below that have not been modified in over 90 days	find /var/tmp/stuff -mtime +90 -exec /bin/rm {} \+
Find all files under current directory and write the paths without the leading ./ in the file outputfile	find . -type f -printf '%P\n' > outputfile
Search for first match of the regex 're' in all *.coffee files under current directory	find . -name \*.coffee -exec awk '/re/ {print;exit}' {} \;
Find files with a question mark in their names	find . -name \\\?\
Get directory listing of URL $1 and save them to variable 'header' by deleting '\r' characters	header="$"
show all files in /usr/tom and display only files ending with ".pl" or ".pm"	find /usr/tom \| egrep '.pl\| .pm'
Interpret backslash sequences and delete whitespace characters in variable $FOO and save the result to variable 'FOO_NO_WHITESPACE'	FOO_NO_WHITESPACE="$(echo -e "${FOO}" \| tr -d '[[:space:]]')"
Search the .log files in the current directory tree for string "The SAS System"	find `pwd` -name "*.log" -exec grep "The SAS System" {} \;
List all files in the /hometest directory tree whose names are "Trash", and their sizes	find /hometest -name Trash -exec ls -s {} \;

Check if a drive with UUID "09b8f1ab-8d4b-4c5f-b395-40be09c090b0" is mounted

mount | grep $

Search the files in the current directory tree that are named "string to be searched" for "text"

find . -name "string to be searched" -exec grep "text" "{}" \;

Find and print the names of all files found in the current directory and all of its sub-directories

find . -print

display all the files in the current directory and do not search in the sub directories

find . -maxdepth 0 -print

Find all *.txt files/directories under current directory

find -name '*.txt'

Print the hexadecimal bytes and printable characters of "Hello world"

echo Hello world | od -t x1 -t c

Find empty regular files in /dir and its subdirectories

find /dir -type f -size 0 -print

search for the text file "file.txt" and display its parent directory

cd /nfs/office/ && find . -name 'file.txt' | sed -r 's|(\./?).*|\1|'

Compress all .txt files in the current directory tree to archive "txt.zip"

find . -name '*.txt' | xargs zip -9 txt.zip

Find all files/directories under $1 which have at least execute permission for their owner and set execute permission for group for these files/directories

find $1 -perm -u+x -exec chmod g+x {} \;

display all the files in the current folder excluding those which are in the path of ".git"

find . ! -path "*.git*" -type f -print

Search for regular files of the grooup 'users' in the file system

find / -type f -group users

Find all regular files in /usr/bin accessed more than 20 days ago

find /usr/bin -type f -atime +20

display all the files in the current folder

find . | awk '{ print "FILE:" $0 }'

Format the time string $timestamp according to the format string "%Y-%m-%d %H:%M:%S" and save the output to variable 'CDATE'

CDATE=$( date -d @"$timestamp" +"%Y-%m-%d %H:%M:%S" )

find all the files in the folder /work which belong to the user "olivier"

find /work -user olivier -print

show the disk use of all the regular/normal files in the current folder which are bigger than 50MB

find . -type f -size +50000k | xargs du -sh

Print the first line of each file under the home directory

find $HOME/. -name *.txt -exec head -n 1 -v {} \;

Join colon-separated information in 3 files LN.txt PH.txt and AD.txt in a cascade fashion: join LN.txt and PH.txt, then join the result with AD.txt

join -t':' < < | join -t':' - <

display all the files ending with ".user" or beginning with "admin" or ending with ".user.gz" in /var/adm/logs/morelogs/ and excluding all regular files

find /var/adm/logs/morelogs/* -type f -prune $ -name "admin.*" -o -name "*.user" -o -name "*.user.gz" $ -print

Search for "ifconfig" in the output of "history" and print 5 lines that precede and follow

history | grep ifconfig -A5 -B5

A no-op on filename with sed

sed -i "s/\\\\\n//g" filename

find all the files in the folder /usr/bin which have been modified in the last 10 days

find /usr/bin -type f -mtime -10

Print a space separated list of numbers from 1 to 10 with no trailing new line

seq 10 | xargs echo -n

Take a file path from standard input and remove it.

xargs -I '{}' rm '{}'

Show ls's detailed output for all files named "something"

find . -name something -exec ls -l {} \;

Change directory to the current user's home directory

cd /home/`whoami`

find regular files under the current directory, whose name ends in .mbox and rename each file, to the same name without .mbox at the end

find . -type f -wholename \*.mbox | sed 's/\\.mbox/mv "\1.mbox" "\1"/' | sh

Find files/directories that have no owner or group under /path

find /path -nouser -or -nogroup

Get the disk space used by all *.txt files/directories under /path directory

find /path -iname '*.txt' | perl -lane '$sum += -s $_; END {print $sum}'

Copy all files in current directory that do not match */not-from-here/* in their paths to /dest

find . -type f -not -path '*/not-from-here/*' -exec cp '{}' '/dest/{}' \;

Remove the last 3 characters from 987654321, keeping only 987654

echo 987654321 | rev | cut -c 4- | rev

Unzip all ".gz" files in the current directory tree excluding files containing "dvportgroups", "nsanity", "vcsupport", "viclient", and "vsantraces"

find . -name '*.gz' ! -name '*dvportgroups*' ! -name '*nsanity*' ! -name '*vcsupport*' ! -name '*viclient*' ! -name 'vsantraces*' -exec gunzip -vf {} \;

display the number of lines in all the header files in the current folder

find . -name "*.h" -print | xargs wc -l

List all files in the current directory tree that were modified 60 minutes ago

find . -mmin 60 | xargs '-rd\n' ls -l

Find all *.php files under current directory and change their permission to 640

chmod 640 $(find . -name *.php)

Move all files in "/path/subfolder" to "/path" without clobbering any destination files

find /path/subfolder -maxdepth 1 -type f -name '*' -exec mv -n {} /path \;

Set variable GZIP to the full path of command "gzip"

GZIP="$(which gzip)"

Get the total sizes of all files under current directory

find path -type f -printf '%s\n' | awk '{sum += $1} END {print sum}'

Find every directory under "0001" and make new directories replacing "0001" with "0002" at the beginning of their names.

find 0001 -type d | sed 's/^0001/0002/g' | xargs mkdir

Returns the single most recent file in a directory

ls -t | head -n1

Archive "./htmlguide" to "~/src/" with resolved symbolic links and delete any extraneous files from "~/src/" not found in "./htmlguide"

rsync -av --copy-dirlinks --delete ../htmlguide ~/src/

Recursively changes group ownership of everything within '/git/our_repos' to 'shared_group'.

chgrp -R shared_group /git/our_repos

Display users who are currently logged in

finger | sed 's/^\ *\ *pts[^A-Z]*\([^.*/\2\t\t\3/'

Run script $2 on remote host $1 using interpreter $INTERPRETER with pseudo-terminal allocation

cat $2 | grep -v "#" | ssh -t $1 $INTERPRETER

Print an octal dump of "file" with named characters, no addresses, and no suppressed duplicate lines with sections starting with "esc", "fs", "gs", or "us"

od -a -An -v file | perl -0777ne 's/\n//g,print "$_\n " for /?(?:.)*/gs'

Recursively change owner to "$1" and group to "httpd" of all files in the current directory

chown -R $1:httpd *

Create a ssh key with no passphrase and store it in "outfile".

ssh-keygen -f outfile -N ''

Execute the first instance of "parallel" found in the PATH, passing it all parameters received by the script/function

`which parallel` "$@"

Gets IP address of ${NET_IF} network interface.

NET_IP=`ifconfig ${NET_IF} | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'`

Display non-hidden files in the current directory with the given output format

find . -maxdepth 1 -name '[!.]*' -printf 'Name: %16f Size: %6s\n'

Changes group ownership of 'myprog' to 'groupb'.

chgrp groupb myprog

Find all the files in file system which are accessed 50 days back

find / -atime 50

Go to directory named "~" (not home directory)

cd "~"

Perform a dry run to recursively copy "test/a" to "test/dest" excluding "test/a/b/c/d"

rsync -nvraL test/a test/dest --exclude=a/b/c/d

Gives the primary group of $USERNAME.

groups $USERNAME | cut -d\ -f 1

Recursively list all files on smbfs mounts

mount -v | grep smbfs | awk '{print $3}' | xargs ls -lsR

Find directories starting from /TBD that were modified more than 1 day ago

find /TBD -mtime +1 -type d

See the word count of every *.txt file in the home directory

find ~/ -name '*.txt' -print0 | xargs -0 wc -w

Create a symbolc link in the current directory to "target"

ln -s target

Gets MAC address of eth0 network interface.

ifconfig eth0 | grep -Eoi [:0-9A-F:]{2}\{5}

Convert standard input into a dump of octal bytes without the first 8 bytes of address and count the unique results

Find all *.txt files under current directory and copy them to ./tmp

find . -type f -name '*.txt' | sed 's/'"'"'/\'"'"'/g' | sed 's/.*/"&"/' | xargs -I{} cp -v {} ./tmp/

Write "error" to standard output

echo "error" | tee

Prints Kb size of all top-level files and folders in a current folder in descending order in human readable format.

du -ksh * | sort -n -r

Find all *.foo files under current directory and print their contents

cat `find . -name '*.foo' -print`

Find files that are writable by the user, the group, or both under the plsql directory

find plsql -type f -perm /220 -exec ls -l {} \; 2>/dev/null

find all files in the current folder that have a single letter in their name and have not been modified today

find . -name \? -mtime +0

Find all files under 'dir' directory with white space safety in their paths and print their md5 sums into file.txt

find dir -type f -print0 | xargs -0 md5sum >> file.txt

find the path of a specfic video file in the current directory

find ./ -name "foo.mp4" -printf "%h\n"

Split the sorted and unique lines in files "emails_*.txt" into files with at most 200 lines each with numeric suffixes of length 4

sort --unique emails_*.txt | split --numeric-suffixes --lines=200 --suffix-length=4 --verbose

Search for files that were accessed less than 5 days ago.

find -atime -5

Join columns in "file1" and "file2" if their first field matches and format the output as a table

awk 'NR==FNR{m[$1]=$2" "$3; next} {print $0, m[$1]}' file2 file1 | column -t

Check if "$file" contains DOS line endings

od -t x2 -N 1000 $file | cut -c8- | egrep -m1 -q ' 0d| 0d|0d$'

Find all directories under current directory and change their permission to 500

find . -type d -exec chmod 500 {} \;

Removes all files but $1 newest ones from current folder.

ls -tp | grep -v '/' | tail -n +"$1" | xargs -I {} rm -- {}

Search in the current directory and all sub-directories except ./D and any further sub-directories also named D for the file named hi.dat

$ find . $ -name D -prune $ -o -name hi.dat

display the contents of all the files ending with ".fq" and perform a control check on this raw sequence of data and display the output to the screen

find . -name "*.fq" -exec cat '{}' ';' | fastqc /dev/stdin

Find the files in the current directory that match pattern '*.JUKEBOX.*.txt' and move them to folder ./JUKEBOX

find . -name '*.JUKEBOX.*.txt' -maxdepth 1 -print0 | xargs -0 -IFILE mv FILE ./JUKEBOX

Search for .bam files anywhere in the current directory recursively

find . -name "*.bam"

find all the files in the current folder which are bigger than 10MB and less than 50MB

find . -size +10M -size -50M -print

Search the CSS files found in the current directory tree for string "foo"

find . -name \*.css -print0 | xargs -0 grep -nH foo

Decompress 'file.gz'

gzip -d file.gz

find all js files under the build direcotry except build/external and build/log directory.

find build -not $ -path build/external -prune $ -not $ -path build/blog -prune $ -name \*.js

Display the differences between "file1.cf" and "file2.cf" side-by-side with a width of 150 characters

diff -y -W 150 file1.cf file2.cf

Find only number of hard link & name of files from long list

find -type f -iname "*.txt" -exec ls -lrt {} \;|awk -F' ' '{print $1 $2 $9}'

Find all user files larger than 5MB

find / -size +5000000c 2> /dev/null

Mount the directory "/etc" on "/tmp/sarnold/mount_point/"

mount -obind /etc /tmp/sarnold/mount_point/

create an archive using 7zhelper.sh as a compress program

tar -I 7zhelper.sh -cf OUTPUT_FILE.tar.7z paths_to_archive

Display all lines containing PROBES in the current kernel's compile-time config file.

grep PROBES /boot/config-$

Reversibly sorts content of the '${TMP}/${SCRIPT_NAME}.pid' file, comparing human readable numbers in file strings.

cat ${TMP}/${SCRIPT_NAME}.pid|sort -rh;

Delete files in /var/tmp/stuff and below that have not been modified in over 90 days

find /var/tmp/stuff -mtime +90 -exec /bin/rm {} \+

Find all files under current directory and write the paths without the leading ./ in the file outputfile

find . -type f -printf '%P\n' > outputfile

Search for first match of the regex 're' in all *.coffee files under current directory

find . -name \*.coffee -exec awk '/re/ {print;exit}' {} \;

Find files with a question mark in their names

find . -name \*\\?\*

Get directory listing of URL $1 and save them to variable 'header' by deleting '\r' characters

header="$"

show all files in /usr/tom and display only files ending with ".pl" or ".pm"

find /usr/tom | egrep '*.pl| *.pm'

Interpret backslash sequences and delete whitespace characters in variable $FOO and save the result to variable 'FOO_NO_WHITESPACE'

FOO_NO_WHITESPACE="$(echo -e "${FOO}" | tr -d '[[:space:]]')"

Search the .log files in the current directory tree for string "The SAS System"

find `pwd` -name "*.log" -exec grep "The SAS System" {} \;

List all files in the /hometest directory tree whose names are "Trash", and their sizes

find /hometest -name Trash -exec ls -s {} \;