please advise me about the following. On my Linux machine - I do the following:$ env | grep -i LESSOPENLESSOPEN=|/usr/bin/lesspipe.sh %sSo from env command I see that:LESSOPEN=|/usr/bin/lesspipe.sh %sI want to change the variable LESSOPEN, so I do the following search in order to find where it's located, so I can make this change.$ grep -Ril LESSOPEN /But the grep search did not find any such file with LESSOPEN. Please advise on which file LESSOPEN variable is defined, so I can change its value.
Which file defines the LESSOPEN environment variable?
configuration;environment variables;less
On Red Hat and CentOS systems, it is defined in /etc/profile.d/less.sh. On version 5, this contains# less initialization script (sh)[ -x /usr/bin/lesspipe.sh ] && export LESSOPEN=${LESSOPEN-|/usr/bin/lesspipe.sh %s}On other systems, such as version 7, the value may be ||/usr/bin/lesspipe.sh %s; there is a slightly different interpretation between values that begin with | and ||, detailed in the man page for less.You can either edit that file if you want all users of bash-like shells on your system to see a different value, or override it for yourself by editing ~/.bashrc or ~/.bash_profile to have an export LESSOPEN=whatever line.On Linux systems, grep -r string / or grep -R string / may run into problems when reading certain special files. grep will hang when reading /dev/rfkill, and, due to what I believe is a buffer allocation bug, will run out of memory reading certain large files in /proc. An alternative is to exclude /dev and /proc:find / '(' -path /proc -o -path /dev ')' -prune -o -type f -exec grep -il lessopen {} +