To sum it up....This works:awk 'BEGIN { FS=:; }{ print  $1  $3  $5; }' /etc/passwdBut this doesn't:awk 'BEGIN { FS=:; }{ echo  $1  $3  $5; }' /etc/passwdBeing fairly new to learning bash, I would like to know why.
Why does print work with awk but echo doesn't?
awk;echo
The structure of awk execution is: pattern { action statements }Actions      Action statements are enclosed in braces, { and }.  Action statements         consist of the usual assignment, conditional, and looping statements         found in most languages.  The operators, control statements, and         input/output statements available are patterned after those in C.print is I/O statement of awk.From manpage:print                 Print the current record.  The output record is terminated with the value of ORS.Visit manual>The print Statement:The print StatementUse the print statement to produce output with simple, standardized formatting. You specify only the strings or numbers to print, in a list separated by commas. They are output, separated by single spaces, followed by a newline. The statement looks like this:print item1, item2, Visit man awk for more details.Also note that:PATTERNS AND ACTIONS       AWK is a line-oriented language.  The pattern comes  first,  and  then  the  action.   Action  statements  are       enclosed  in  {  and  }.  Either the pattern may be missing, or the action may be missing, but, of course, not       both.  If the pattern is missing, the action is executed for every single record of input.  A  missing  action       is equivalent to              { print }       which prints the entire record.awk doesn't have echo keyword/statement.$ man awk | grep echo | wc -l0