Linux Shell Tricks

Find Large Files

Find files more than 50MB

# cd /
# find . -type f -size +50M -exec ls -lh {} \; | awk '{ print $5 ": " $9 }' | sort -k1

Find String in files

grep -rnw 'directory' -e "pattern"

HOWTO Remove comments and blank lines in a config file

Grep can remove all the comments and all the blank lines from a configuration file.
grep  -v ^# configfile | grep -v ^$

will remove all lines beginning with # (While keeping lines with comments after the setting, as in Whatever = Foo #sets Whatever to Foo)
grep -v ^#

removes all blank lines
grep -v ^$ removes all blank lines.