NAME | SYNOPSIS | DESCRIPTION | COMMAND SYNOPSIS | REGULAR EXPRESSIONS | BUGS | AUTHOR | COPYRIGHT | SEE ALSO | COLOPHON

SED(1)                          User Commands                         SED(1)

NAME         top

       sed - stream editor for filtering and transforming text

SYNOPSIS         top

       sed [OPTION]... {script-only-if-no-other-script} [input-file]...

DESCRIPTION         top

       Sed is a stream editor.  A stream editor is used to perform basic
       text transformations on an input stream (a file or input from a
       pipeline).  While in some ways similar to an editor which permits
       scripted edits (such as ed), sed works by making only one pass over
       the input(s), and is consequently more efficient.  But it is sed's
       ability to filter text in a pipeline which particularly distinguishes
       it from other types of editors.

       -n, --quiet, --silent

              suppress automatic printing of pattern space

       -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.

       -r, --regexp-extended

              use extended regular expressions in the script.

       -s, --separate

              consider files as separate rather than as a single continuous
              long stream.

       -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: <http://www.gnu.org/software/sed/>.  General help
       using GNU software: <http://www.gnu.org/gethelp/>.  E-mail bug
       reports to: <bug-sed@gnu.org>.  Be sure to include the word ``sed''
       somewhere in the ``Subject:'' field.

COMMAND SYNOPSIS         top

       This is just a brief synopsis of sed commands to serve as a reminder
       to those who already know sed; other documentation (such as the
       texinfo document) must be consulted for fuller descriptions.

   Zero-address ``commands''
       : label
              Label for b and t commands.

       #comment
              The comment extends until the next newline (or the end of a -e
              script fragment).

       }      The closing bracket of a { } block.

   Zero- or One- address commands
       =      Print the current line number.

       a \

       text   Append text, which has each embedded newline preceded by a
              backslash.

       i \

       text   Insert text, which has each embedded newline preceded by a
              backslash.

       q [exit-code]
              Immediately quit the sed script without processing any more
              input, except that if auto-print is not disabled the current
              pattern space will be printed.  The exit code argument is a
              GNU extension.

       Q [exit-code]
              Immediately quit the sed script without processing any more
              input.  This is a GNU extension.

       r filename
              Append text read from filename.

       R filename
              Append a line read from filename.  Each invocation of the
              command reads a line from the file.  This is a GNU extension.

   Commands which accept address ranges
       {      Begin a block of commands (end with a }).

       b label
              Branch to label; if label is omitted, branch to end of script.

       c \

       text   Replace the selected lines with text, which has each embedded
              newline preceded by a backslash.

       d      Delete pattern space.  Start next cycle.

       D      If pattern space contains no newline, start a normal new cycle
              as if the d command was issued.  Otherwise, delete text in the
              pattern space up to the first newline, and restart cycle with
              the resultant pattern space, without reading a new line of
              input.

       h H    Copy/append pattern space to hold space.

       g G    Copy/append hold space to pattern space.

       l      List out the current line in a ``visually unambiguous'' form.

       l width
              List out the current line in a ``visually unambiguous'' form,
              breaking it at width characters.  This is a GNU extension.

       n N    Read/append the next line of input into the pattern space.

       p      Print the current pattern space.

       P      Print up to the first embedded newline of the current pattern
              space.

       s/regexp/replacement/
              Attempt to match regexp against the pattern space.  If
              successful, replace that portion matched with replacement.
              The replacement may contain the special character & to refer
              to that portion of the pattern space which matched, and the
              special escapes \1 through \9 to refer to the corresponding
              matching sub-expressions in the regexp.

       t label
              If a s/// has done a successful substitution since the last
              input line was read and since the last t or T command, then
              branch to label; if label is omitted, branch to end of script.

       T label
              If no s/// has done a successful substitution since the last
              input line was read and since the last t or T command, then
              branch to label; if label is omitted, branch to end of script.
              This is a GNU extension.

       w filename
              Write the current pattern space to filename.

       W filename
              Write the first line of the current pattern space to filename.
              This is a GNU extension.

       x      Exchange the contents of the hold and pattern spaces.

       y/source/dest/
              Transliterate the characters in the pattern space which appear
              in source to the corresponding character in dest.

Addresses
       Sed commands can be given with no addresses, in which case the
       command will be executed for all input lines; with one address, in
       which case the command will only be executed for input lines which
       match that address; or with two addresses, in which case the command
       will be executed for all input lines which match the inclusive range
       of lines starting from the first address and continuing to the second
       address.  Three things to note about address ranges: the syntax is
       addr1,addr2 (i.e., the addresses are separated by a comma); the line
       which addr1 matched will always be accepted, even if addr2 selects an
       earlier line; and if addr2 is a regexp, it will not be tested against
       the line that addr1 matched.

       After the address (or address-range), and before the command, a !
       may be inserted, which specifies that the command shall only be
       executed if the address (or address-range) does not match.

       The following address types are supported:

       number Match only the specified line number (which increments
              cumulatively across files, unless the -s option is specified
              on the command line).

       first~step
              Match every step'th line starting with line first.  For
              example, ``sed -n 1~2p'' will print all the odd-numbered lines
              in the input stream, and the address 2~5 will match every
              fifth line, starting with the second.  first can be zero; in
              this case, sed operates as if it were equal to step.  (This is
              an extension.)

       $      Match the last line.

       /regexp/
              Match lines matching the regular expression regexp.

       \cregexpc
              Match lines matching the regular expression regexp.  The c may
              be any character.

       GNU sed also supports some special 2-address forms:

       0,addr2
              Start out in "matched first address" state, until addr2 is
              found.  This is similar to 1,addr2, except that if addr2
              matches the very first line of input the 0,addr2 form will be
              at the end of its range, whereas the 1,addr2 form will still
              be at the beginning of its range.  This works only when addr2
              is a regular expression.

       addr1,+N
              Will match addr1 and the N lines following addr1.

       addr1,~N
              Will match addr1 and the lines following addr1 until the next
              line whose input line number is a multiple of N.

REGULAR EXPRESSIONS         top

       POSIX.2 BREs should be supported, but they aren't completely because
       of performance problems.  The \n sequence in a regular expression
       matches the newline character, and similarly for \a, \t, and other
       sequences.

BUGS         top

       E-mail bug reports to bug-sed@gnu.org.  Also, please include the
       output of ``sed --version'' in the body of your report if at all
       possible.

AUTHOR         top

       Written by Jay Fenlason, Tom Lord, Ken Pizzini, and Paolo Bonzini.
       GNU sed home page: <http://www.gnu.org/software/sed/>.  General help
       using GNU software: <http://www.gnu.org/gethelp/>.  E-mail bug
       reports to: <bug-sed@gnu.org>.  Be sure to include the word ``sed''
       somewhere in the ``Subject:'' field.

COPYRIGHT         top

       Copyright © 2012 Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO         top

       awk(1), ed(1), grep(1), tr(1), perlre(1), sed.info, any of various
       books on sed, the sed FAQ
       (http://sed.sf.net/grabbag/tutorials/sedfaq.txt),
       http://sed.sf.net/grabbag/.

       The full documentation for sed is maintained as a Texinfo manual.  If
       the info and sed programs are properly installed at your site, the
       command

              info sed

       should give you access to the complete manual.

COLOPHON         top

       This page is part of the sed (stream-oriented editor) project.
       Information about the project can be found at 
       ⟨http://www.gnu.org/software/sed/⟩.  If you have a bug report for this
       manual page, send it to bug-sed@gnu.org.  This page was obtained from
       the tarball sed-4.2.2.tar.gz fetched from 
       ⟨https://www.gnu.org/software/sed/⟩ on 2016-08-07.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

sed 4.2.2                       December 2012                         SED(1)