advanced-bash-techniques


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  Snapshot: 2026-10-16T05:04:13Z
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advanced bash techniques

find and change all files

    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

    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

    sudo cat access.log | awk '{ print $1; }' | sort | uniq -c | sort -n

Bash Perl search and replace multiple files one liner

    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

    sed -i'' -e 's/search/replace/g' *

Get a coma separated list of libvirt guests

    virsh list | egrep -v 'Domain|Name|----|^$' | awk '{printf "%s," , $2}' > /tmp/virthosts

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Source:
https://foxhop.net/f348124b-2f95-11f1-a15f-e86a64d24d78/advanced-bash-techniques
Snapshot: 2026-10-16T05:04:13Z
Generator: Remarkbox d747782