> **Source:** [https://foxhop.net/f348124b-2f95-11f1-a15f-e86a64d24d78/advanced-bash-techniques](https://foxhop.net/f348124b-2f95-11f1-a15f-e86a64d24d78/advanced-bash-techniques) > **Snapshot:** 2026-10-16T05:38:20Z > **Generator:** Remarkbox `d747782` > > *This is a thread snapshot. The living document lives at the source URI above — it may have been edited, extended, or replied-to since.*



# advanced bash techniques find and change all files ::: {#cb1} sudo find . -type f -print0 | xargs -0 ls -hal sudo find . -type f -print0 | xargs -0 sudo chown www-data:www-data sudo find . -type f -print0 | xargs -0 sudo chmod 0644 ::: find and change all directories: > sudo find . -type d -print0 \| xargs -0 sudo chmod 0775 # Remove a particular line from all files in a directory ::: {#cb2} for file in /tmp/test/* do cp -p $file $file.tmp egrep -v "RegexToRemove" $file.tmp > $file rm -rf $file.tmp done ::: # apache logs count unique ip addresses ::: {#cb3} sudo cat access.log | awk '{ print $1; }' | sort | uniq -c | sort -n ::: # Bash Perl search and replace multiple files one liner ::: {#cb4} perl -pi -w -e 's/search/replace/g;' *.extension ::: explanation: > **-e** > > : means execute the following line of code. > > **-i** > > : means edit in-place > > **-w** > > : write warnings > > **-p** > > : loop # Bash sed search and replace multiple files one liner ::: {#cb5} sed -i'' -e 's/search/replace/g' * ::: # Get a coma separated list of libvirt guests ::: {#cb6} virsh list | egrep -v 'Domain|Name|----|^$' | awk '{printf "%s," , $2}' > /tmp/virthosts ::: --- **Source:** [https://foxhop.net/f348124b-2f95-11f1-a15f-e86a64d24d78/advanced-bash-techniques](https://foxhop.net/f348124b-2f95-11f1-a15f-e86a64d24d78/advanced-bash-techniques) **Snapshot:** 2026-10-16T05:38:20Z **Generator:** Remarkbox `d747782`