CentOS 7.0 - man page for sed (centos section 1)

Linux & Unix Commands - Search Man Pages

Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


SED(1)					  User Commands 				   SED(1)

NAME
       sed - stream editor for filtering and transforming text

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

DESCRIPTION
       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  edi-
       tor  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)

       -c, --copy

	      use copy instead of rename when shuffling files in -i mode

       -b, --binary

	      does  nothing; for compatibility with WIN32/CYGWIN/MSDOS/EMX ( open files in binary
	      mode (CR+LFs are not treated specially))

       -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
       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 charac-
	      ter & 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
       POSIX.2	BREs should be supported, but they aren't completely because of performance prob-
       lems.  The \n sequence in a regular expression matches the newline  character,  and  simi-
       larly for \a, \t, and other sequences.

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

AUTHOR
       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
       Copyright  (C)  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
       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.

sed 4.2.2				    June 2014					   SED(1)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 12:42 PM.

Unix & Linux Forums Content Copyright©1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password





Not a Forum Member?
Forgot Password?