sed
sed (stream editor) is a program that uses regular expressions to programmatically modify streams of text. In meany ways sed is an evolved ed with significantly more advanced scripting capabilities than its predecessor. Where ed sees occasional use as a means to edit individual lines within a file sed is commonly used to transform entire documents. In this capacity sed has historically been second only to Perl — which has the advantage of being a complete programming language it its own right — in its ability to rapidly manipulate large quantities of text with regular expressions. In modern environments that require grapheme-level Unicode support or recursive grammars, Raku occasionally edges-out both sed and Perl for such workloads.
Installation
sed is part of @system and needs no separate installation.
USE flags
USE flags for sys-apps/sed Super-useful stream editor
acl
|
Add support for Access Control Lists |
nls
|
Add Native Language Support (using gettext - GNU locale utilities) |
selinux
|
!!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur |
static
|
!!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically |
verify-sig
|
Verify upstream signatures on distfiles |
Emerge
root #emerge --ask sys-apps/sedUsage
The article in the devmanual might help.
user $sed --helpUsage: sed [OPTION]... {script-only-if-no-other-script} [input-file]...
-n, --quiet, --silent
suppress automatic printing of pattern space
--debug
annotate program execution
-e script, --expression=script
add the script to the commands to be executed
-f script-file, --file=script-file
add the contents of script-file to the commands to be executed
--follow-symlinks
follow symlinks when processing in place
-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if SUFFIX supplied)
-l N, --line-length=N
specify the desired line-wrap length for the `l' command
--posix
disable all GNU extensions.
-E, -r, --regexp-extended
use extended regular expressions in the script
(for portability use POSIX -E).
-s, --separate
consider files as separate rather than as a single,
continuous long stream.
--sandbox
operate in sandbox mode (disable e/r/w commands).
-u, --unbuffered
load minimal amounts of data from the input files and flush
the output buffers more often
-z, --null-data
separate lines by NUL characters
--help display this help and exit
--version output version information and exit
If no -e, --expression, -f, or --file option is given, then the first
non-option argument is taken as the sed script to interpret. All
remaining arguments are names of input files; if no input files are
specified, then the standard input is read.
GNU sed home page: <https://www.gnu.org/software/sed/>.
General help using GNU software: <https://www.gnu.org/gethelp/>.
E-mail bug reports to: <bug-sed@gnu.org>.
Unmerge
root #emerge --ask --depclean --verbose sys-apps/sedSee also
- ed — a line-based text editor with support for regular expressions
- grep — a tool for searching text files with regular expressions
- awk — a scripting language for data extraction
- Perl — a general purpose interpreted programming language with a powerful regular expression engine.
- Raku — a high-level, general-purpose, and gradually typed programming language with low boilerplate objects, optionally immutable data structures, and an advanced macro system.