SED / AWK

sed options

• s - substitute
• i - insert
• a - append
• d - delete

To pass a file with sed commands:

• sed -f sample.sed file.txt

Replace from the beginning of line

• sed 's/^night/day/'

Replace from end of line

• sed 's/ $//' - Replace space at end of line

 Delete lines of file.txt, starting with line X

• sed 'X,$d' file.txt

Remove all white space from beginning of line

• echo "     This is a test" | sed -e 's/^[ \t]*//'

 Edit a file in place:

• sed -i 's/BOB/JANE/' file.txt

Removing most things in between ( and ) in a file

•  sed 's/([a-z,A-Z,0-9,+*!]*)//g'

Remove empty lines from a file:

• sed '/^$/d'

 Remove everything except the number one....

• sed 's/[^1//g'