Sed and Awk one-liners

Convert Windows line endings to Unix:

sed 's/^M$//'

Remove leading whitespace from each line:

sed 's/^[ \t]*//'

Replace all occurrences of "foo" with "bar

sed 's/foo/bar/g'

Bash for loop to replace text within multiple files at once

Example:

for file in `git grep -l doouble`; do sed -i 's/douuble/double/g' $file;done

Replace git grep -l doouble with any command that returns filenames