useful shell commands, sed replace, mongodb log

gistfile1.txt

perl -ne '/([0-9a-z]{24,24})/ and print $1, "\n"' 01_07.txt

# run command with only 1 argument (-L 1, --max-lines 1) and ask before each command
ls -la | xargs --interactive -L 1 echo
# substitution in xargs
xargs -L 1 -I{} echo "ID IS: {}"

sed -i -e s/\,\.\$comment:.\".*\"// mongodb_short_sed.log