refCLI

# sed

Find and Replace

Find and remove all instances of TEXT:

sed 's/TEXT//g'

Find and remove all spaces:

sed -e 's/ //g'

Delete all blank lines from a file

sed '/^$/d' <FILE>

Delete leading whitespace from front of each line

sed 's/^[ \t]*//' <FILE>

Delete trailing whitespace from end of each line

sed 's/[ \t]*$//' <FILE>

Delete leading and trailing whitespace from each line

sed 's/^[ \t]*//;s/[ \t]*$//' <FILE>

Insert a line of text before a line

sed -i '/PATTERN/i REPLACEWITH' <FILE>

Change configuration file values

Change BRIDGE_HOTPLUG=yes to BRIDGE_HOTPLUG=no no matter what it is already set to:

sed '/BRIDGE_HOTPLUG=/ s/=.*/=no/' /etc/default/bridge-utils

Change PermitRootLogin no to PermitRootLogin yes no matter what it is already set to:

sed '/PermitRootLogin / s/ .*/ yes/' /etc/ssh/sshd_config

Wrap Value in Double Quotes

Change date=2015 to date=“2015”:

echo 'date=2015' | sed 's/\(=[[:blank:]]*\)\(.*\)/\1"\2"/'

Remove word wrap

sed -e :a -e '$!N;s/\n //;ta' -e 'P;D' <FILE>

sed -n 's/.*href="\([^"]*\).*/\1/p' <FILE.html>

References