כמה טיפים שעושים את החיים קלים יותר
# Delete all files EXCEPT:
rm !(*.sh|*.py) /some/directory
# Delete the contents of a file
> file
# Truncate the contents of a variable
var="abcde"; echo ${var%d*}
abc
ls -lSr # Show files by size, biggest last
shopt -s autocd # Simply type '..' to go back a directory, instead of 'cd ..'
shopt -s dirspell # Auto-corrects directory names when using 'tab' (awesome stuff!!!)
date -d @1232144092 # Will convert the Linux timestamp to human-readable form