Man Pages

sed(1) - phpMan sed(1) - phpMan

Command: man perldoc info search(apropos)  


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 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; hard links will still be broken.

       -i[SUFFIX], --in-place[=SUFFIX]

              edit files in place (makes backup if extension supplied).  The default operation mode is to  break  sym-
              bolic and hard links.  This can be changed with --follow-symlinks and --copy.

       -c, --copy

              use  copy instead of rename when shuffling files in -i mode.  While this will avoid breaking links (sym-
              bolic or hard), the resulting editing operation is not atomic.  This is rarely the desired mode;  --fol-
              low-symlinks is usually enough, and it is both faster and more secure.

       -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

       --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-gnu-utilsATgnu.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 docu-
       mentation (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 dis-
              abled 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.

       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.

       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      Delete  up  to the first embedded newline in the pattern space.  Start next cycle, but skip reading from
              the input if there is still data in the pattern space.

       h H    Copy/append pattern space to hold space.

       g G    Copy/append hold space to pattern space.

       x      Exchange the contents of the hold and pattern spaces.

       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  pat-
              tern  space  which matched, and the special escapes \1 through \9 to refer to the corresponding matching
              sub-expressions in the regexp.

       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.

       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.

       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  exten-
              sion.)

       $      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 problems.  The \n sequence
       in a regular expression matches the newline character, and similarly for \a, \t, and other sequences.

BUGS
       E-mail bug reports to bonziniATgnu.org.  Be sure to include the  word  ''sed''  somewhere  in  the  ''Subject:''
       field.  Also, please include the output of ''sed --version'' in the body of your report if at all possible.

COPYRIGHT
       Copyright (C) 2009 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABIL-
       ITY or FITNESS FOR A PARTICULAR PURPOSE, to the extent permitted by law.

       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-gnu-utilsATgnu.org>.  Be sure to include the word
       ''sed'' somewhere in the ''Subject:'' field.

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 version 4.2.1                  June 2012                            SED(1)