====== Shell scripting ======

=== find ===

  * Find the 25 biggest files into a filesystem:
<cli prompt='#'>
# find /var -xdev -type f -ls | sort +6nr | head -25 
</cli>

  * Find the zero size files and modified in the 5 latest days:
<cli prompt='#'>
# find /var -mtime -5 -size 0c -ls
</cli>

=== sed (AIX) ===

  * Remove empty lines:
<cli prompt='#'>
# sed '/^$/d' 
</cli>

  * Add at the end of lines containing pattern a special character:
<cli prompt='#'>
# sed '/hdisk/ s/$/;/g' 
</cli>

=== tr (AIX) ===

  * Remove / replace multiple characters, by one:
<cli prompt='#'>
# echo "abc;;;;123" | tr -s ';' 
abc;123
</cli>

=== bc (AIX) ===

  * Use bc for decimal calcul
<cli prompt='#'>
# cap=$(echo 500G | sed 's/G/\*1024/' | sed 's/M//')
# echo "scale=1;$cap" | bc
512000
</cli>

http://www.shellunix.com/ksh.html