sed

Edit text in a scriptable manner.

• Replace the first occurrence of a regular expression in each line of a file, and print the result:

sed 's/{regular_expression}/{replace}/' {filename}

• Replace all occurrences of an extended regular expression in a file, and print the result:

sed -r 's/{regular_expression}/{replace}/g' {filename}

• Replace all occurrences of a string in a file, overwriting the file (i.e. in-place):

sed -i 's/{find}/{replace}/g' {filename}

• Replace only on lines matching the line pattern:

sed '/{line_pattern}/s/{find}/{replace}/' {filename}

• Delete lines matching the line pattern:

sed '/{line_pattern}/d' {filename}

• Print the first 11 lines of a file:

sed 11q {filename}

• Apply multiple find-replace expressions to a file:

sed -e 's/{find}/{replace}/' -e 's/{find}/{replace}/' {filename}

• Replace separator `/` by any other character not used in the find or replace patterns, e.g. `#`:

sed 's#{find}#{replace}#' {filename}

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