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Diff for /src/usr.bin/sed/sed.1 between version 1.20 and 1.21

version 1.20, 2004/01/23 23:08:47 version 1.21, 2004/01/29 21:19:04
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 The form of a  The form of a
 .Nm  .Nm
 command is as follows:  command is as follows:
 .sp  .Pp
 .Dl [address[,address]]function[arguments]  .Dl [address[,address]]function[arguments]
 .sp  .Pp
 Whitespace may be inserted before the first address and the function  Whitespace may be inserted before the first address and the function
 portions of the command.  portions of the command.
 .Pp  .Pp
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 .Nm  .Nm
 cyclically copies a line of input, not including its terminating newline  cyclically copies a line of input, not including its terminating newline
 character, into a  character, into a
 .Em "pattern space" ,  .Em pattern space ,
 (unless there is something left after a  (unless there is something left after a
 .Sq D  .Sq D
 function),  function),
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 deletes the pattern space.  deletes the pattern space.
 .Pp  .Pp
 Some of the functions use a  Some of the functions use a
 .Em "hold space"  .Em hold space
 to save all or part of the pattern space for subsequent retrieval.  to save all or part of the pattern space for subsequent retrieval.
 .Sh "Sed Addresses"  .Sh SED ADDRESSES
 An address is not required, but if specified must be a number (that counts  An address is not required, but if specified must be a number (that counts
 input lines  input lines
 cumulatively across input files), a dollar  cumulatively across input files), a dollar character
 .Pq Ql $  .Pq Ql $
 character that addresses the last line of input, or a context address  that addresses the last line of input, or a context address
 (which consists of a regular expression preceded and followed by a  (which consists of a regular expression preceded and followed by a
 delimiter).  delimiter).
 .Pp  .Pp
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 of the exclamation character  of the exclamation character
 .Pq Ql \&!  .Pq Ql \&!
 function.  function.
 .Sh "Sed Regular Expressions"  .Sh SED REGULAR EXPRESSIONS
 The  The
 .Nm  .Nm
 regular expressions are basic regular expressions (BRE's, see  regular expressions are basic regular expressions (BRE's; see
 .Xr re_format 7  .Xr re_format 7
 for more information).  for more information).
 In addition,  In addition,
 .Nm  .Nm
 has the following two additions to BRE's:  has the following two additions to BRE's:
 .sp  .Pp
 .Bl -enum -compact  .Bl -enum -compact
 .It  .It
 In a context address, any character other than a backslash  In a context address, any character other than a backslash
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 .Sq x  .Sq x
 stands for itself, so that the regular expression is  stands for itself, so that the regular expression is
 .Dq abcxdef .  .Dq abcxdef .
 .sp  .Pp
 .It  .It
 The escape sequence \en matches a newline character embedded in the  The escape sequence \en matches a newline character embedded in the
 pattern space.  pattern space.
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 .Dq XXX  .Dq XXX
 for the pattern  for the pattern
 .Dq abc .  .Dq abc .
 .Sh "Sed Functions"  .Sh SED FUNCTIONS
 In the following list of commands, the maximum number of permissible  In the following list of commands, the maximum number of permissible
 addresses for each command is indicated by [0addr], [1addr], or [2addr],  addresses for each command is indicated by [0addr], [1addr], or [2addr],
 representing zero, one, or two addresses.  representing zero, one, or two addresses.
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 The terminating  The terminating
 .Ql }  .Ql }
 must be preceded by a newline or optional whitespace.  must be preceded by a newline or optional whitespace.
 .sp  .Pp
 .Bl -tag -width "XXXXXX" -compact  .Bl -tag -width "XXXXXXXX" -compact
 .It [2addr] Em function-list  .It [2addr] Em function-list
 Execute  Execute
 .Em function-list  .Em function-list
 only when the pattern space is selected.  only when the pattern space is selected.
 .sp  .Pp
 .It [1addr] Ns Em a Ns \e  .It [1addr] Ns Em a Ns \e
 .It Em text  .It Em text
 .br  .Pp
 Write  Write
 .Em text  .Em text
 to standard output immediately before each attempt to read a line of input,  to standard output immediately before each attempt to read a line of input,
 whether by executing the  whether by executing the
 .Sq N  .Sq N
 function or by beginning a new cycle.  function or by beginning a new cycle.
 .sp  .Pp
 .It [2addr] Ns Em b Ns [label]  .It [2addr] Ns Em b Ns [label]
 Branch to the  Branch to the
 .Sq \&:  .Sq \&:
 function with the specified label.  function with the specified label.
 If the label is not specified, branch to the end of the script.  If the label is not specified, branch to the end of the script.
 .sp  .Pp
 .It [2addr] Ns Em c Ns \e  .It [2addr] Ns Em c Ns \e
 .It Em text  .It Em text
 .br  .Pp
 Delete the pattern space.  Delete the pattern space.
 With 0 or 1 address or at the end of a 2-address range,  With 0 or 1 address or at the end of a 2-address range,
 .Em text  .Em text
 is written to the standard output.  is written to the standard output.
 .sp  .Pp
 .It [2addr] Ns Em d  .It [2addr] Ns Em d
 Delete the pattern space and start the next cycle.  Delete the pattern space and start the next cycle.
 .sp  .Pp
 .It [2addr] Ns Em D  .It [2addr] Ns Em D
 Delete the initial segment of the pattern space through the first  Delete the initial segment of the pattern space through the first
 newline character and start the next cycle.  newline character and start the next cycle.
 .sp  .Pp
 .It [2addr] Ns Em g  .It [2addr] Ns Em g
 Replace the contents of the pattern space with the contents of the  Replace the contents of the pattern space with the contents of the
 hold space.  hold space.
 .sp  .Pp
 .It [2addr] Ns Em G  .It [2addr] Ns Em G
 Append a newline character followed by the contents of the hold space  Append a newline character followed by the contents of the hold space
 to the pattern space.  to the pattern space.
 .sp  .Pp
 .It [2addr] Ns Em h  .It [2addr] Ns Em h
 Replace the contents of the hold space with the contents of the  Replace the contents of the hold space with the contents of the
 pattern space.  pattern space.
 .sp  .Pp
 .It [2addr] Ns Em H  .It [2addr] Ns Em H
 Append a newline character followed by the contents of the pattern space  Append a newline character followed by the contents of the pattern space
 to the hold space.  to the hold space.
 .sp  .Pp
 .It [1addr] Ns Em i Ns \e  .It [1addr] Ns Em i Ns \e
 .It Em text  .It Em text
 .br  .Pp
 Write  Write
 .Em text  .Em text
 to the standard output.  to the standard output.
 .sp  .Pp
 .It [2addr] Ns Em l  .It [2addr] Ns Em l
 (The letter ell.)  (The letter ell.)
 Write the pattern space to the standard output in a visually unambiguous  Write the pattern space to the standard output in a visually unambiguous
 form.  form.
 This form is as follows:  This form is as follows:
 .sp  .Pp
 .Bl -tag -width "carriage-returnXX" -offset indent -compact  .Bl -tag -width "carriage-returnXX" -offset indent -compact
 .It backslash  .It backslash
 \e\e  \e\e
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 a backslash followed by a newline.  a backslash followed by a newline.
 The end of each line is marked with a  The end of each line is marked with a
 .Ql $ .  .Ql $ .
 .sp  .Pp
 .It [2addr] Ns Em n  .It [2addr] Ns Em n
 Write the pattern space to the standard output if the default output has  Write the pattern space to the standard output if the default output has
 not been suppressed, and replace the pattern space with the next line of  not been suppressed, and replace the pattern space with the next line of
 input.  input.
 .sp  .Pp
 .It [2addr] Ns Em N  .It [2addr] Ns Em N
 Append the next line of input to the pattern space, using an embedded  Append the next line of input to the pattern space, using an embedded
 newline character to separate the appended material from the original  newline character to separate the appended material from the original
 contents.  contents.
 Note that the current line number changes.  Note that the current line number changes.
 .sp  .Pp
 .It [2addr] Ns Em p  .It [2addr] Ns Em p
 Write the pattern space to standard output.  Write the pattern space to standard output.
 .sp  .Pp
 .It [2addr] Ns Em P  .It [2addr] Ns Em P
 Write the pattern space, up to the first newline character to the  Write the pattern space, up to the first newline character to the
 standard output.  standard output.
 .sp  .Pp
 .It [1addr] Ns Em q  .It [1addr] Ns Em q
 Branch to the end of the script and quit without starting a new cycle.  Branch to the end of the script and quit without starting a new cycle.
 .sp  .Pp
 .It [1addr] Ns Em r file  .It [1addr] Ns Em r file
 Copy the contents of  Copy the contents of
 .Em file  .Em file
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 .Em file  .Em file
 cannot be read for any reason, it is silently ignored and no error  cannot be read for any reason, it is silently ignored and no error
 condition is set.  condition is set.
 .sp  .Pp
 .It [2addr] Ns Em s Ns /re/replacement/flags  .It [2addr] Ns Em s Ns /re/replacement/flags
 Substitute the replacement string for the first instance of the regular  Substitute the replacement string for the first instance of the regular
 expression in the pattern space.  expression in the pattern space.
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 .Em flags  .Em flags
 in the substitute function is zero or more of the following:  in the substitute function is zero or more of the following:
 .Bl -tag -width "XXXXXX" -offset indent  .Bl -tag -width "XXXXXX" -offset indent
 .It "0 ... 9"  .It 0 ... 9
 Make the substitution only for the N'th occurrence of the regular  Make the substitution only for the N'th occurrence of the regular
 expression in the pattern space.  expression in the pattern space.
 .It g  .It g
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 If the replacement string is identical to that which it replaces, it  If the replacement string is identical to that which it replaces, it
 is still considered to have been a replacement.  is still considered to have been a replacement.
 .El  .El
 .sp  .Pp
 .It [2addr] Ns Em t Ns [label]  .It [2addr] Ns Em t Ns [label]
 Branch to the  Branch to the
 .Ql \&:  .Ql \&:
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 .Sq t  .Sq t
 function.  function.
 If no label is specified, branch to the end of the script.  If no label is specified, branch to the end of the script.
 .sp  .Pp
 .It [2addr] Ns Em w file  .It [2addr] Ns Em w file
 Append the pattern space to the  Append the pattern space to the
 .Em file .  .Em file .
 .sp  .Pp
 .It [2addr] Ns Em x  .It [2addr] Ns Em x
 Swap the contents of the pattern and hold spaces.  Swap the contents of the pattern and hold spaces.
 .sp  .Pp
 .It [2addr] Ns Em y Ns /string1/string2/  .It [2addr] Ns Em y Ns /string1/string2/
 Replace all occurrences of characters in  Replace all occurrences of characters in
 .Em string1  .Em string1
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 character, and a backslash followed by an  character, and a backslash followed by an
 .Sq n  .Sq n
 is replaced by a newline character.  is replaced by a newline character.
 .sp  .Pp
 .Sm off  .Sm off
 .It Xo [2addr] Em !function No ,\ [2addr]  .It Xo [2addr] Em !function No ,\ \&[2addr]
 .Em !function-list  .Em !function-list
 .Xc  .Xc
 .Sm on  .Sm on
 Apply the function or function-list only to the lines that are  Apply the function or function-list only to the lines that are
 .Em not  .Em not
 selected by the address(es).  selected by the address(es).
 .sp  .Pp
 .It [0addr] Ns Em : Ns label  .It [0addr] Ns Em \&: Ns label
 This function does nothing; it bears a label to which the  This function does nothing; it bears a label to which the
 .Sq b  .Sq b
 and  and
 .Sq t  .Sq t
 commands may branch.  commands may branch.
 .sp  .Pp
 .It [1addr] Ns Em =  .It [1addr] Ns Em =
 Write the line number to the standard output followed by a newline character.  Write the line number to the standard output followed by a newline character.
 .sp  .Pp
 .It [0addr]  .It [0addr]
 Empty lines are ignored.  Empty lines are ignored.
 .sp  .Pp
 .It [0addr] Ns Em #  .It [0addr] Ns Em #
 The  The
 .Ql #  .Ql #
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 .Xr grep 1 ,  .Xr grep 1 ,
 .Xr regex 3 ,  .Xr regex 3 ,
 .Xr re_format 7  .Xr re_format 7
   .Pp
   .Pa /usr/share/doc/usd/15.sed/
 .Sh STANDARDS  .Sh STANDARDS
 The  The
 .Nm  .Nm
Legend:
Removed from v.1.20  
changed lines
  Added in v.1.21