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|
# sed(1)
```
sed [opts] [script] [file]
opts:
-i edit file in place
-i.bk edit file in place and create backup file
(with .bk suffix, can be specified differently)
--follow-symlinks
follow symlinks when editing in place
-e SCRIPT add SCRIPT to commands to be executed
(can be specified multiple times)
-f FILE add content of FILE to command to be executed
--debug annotate program execution
```
## Examples
### Delete lines
```sh
# Delete two lines.
echo -e 'aa\nbb\ncc\ndd' | sed '1d;3d'
# bb
# dd
# Delete last ($) line.
echo -e 'aa\nbb\ncc\ndd' | sed '$d'
# aa
# bb
# cc
# Delete range of lines.
echo -e 'aa\nbb\ncc\ndd' | sed '1,3d'
# dd
# Delete lines matching pattern.
echo -e 'aa\nbb\ncc\ndd' | sed '/bb/d'
# aa
# cc
# dd
# Delete lines NOT matching pattern.
echo -e 'aa\nbb\ncc\ndd' | sed '/bb/!d'
# bb
```
### Insert lines
```sh
# Insert before line.
echo -e 'aa\nbb' | sed '2iABC'
# aa
# ABC
# bb
# Insert after line.
echo -e 'aa\nbb' | sed '2aABC'
# aa
# bb
# ABC
# Replace line.
echo -e 'aa\nbb' | sed '2cABC'
# aa
# ABC
# Insert before pattern match.
echo -e 'aa\nbb' | sed '/bb/i 123'
# aa
# 123
# bb
```
### Substitute lines
```sh
# Substitute by regex.
echo -e 'aafooaa\ncc' | sed 's/foo/MOOSE/'
# aaMOOSEaa
# cc
```
### Multiple scripts
```sh
echo -e 'foo\nbar' | sed -e 's/foo/FOO/' -e 's/FOO/BAR/'
# BAR
# bar
```
### Edit inplace through symlink
```sh
touch file
ln -s file link
ls -l link
# lrwxrwxrwx 1 johannst johannst 4 Feb 7 23:02 link -> file
sed -i --follow-symlinks '1iabc' link
ls -l link
# lrwxrwxrwx 1 johannst johannst 4 Feb 7 23:02 link -> file
sed -i '1iabc' link
ls -l link
# -rw-r--r-- 1 johannst johannst 0 Feb 7 23:02 link
```
|
