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Full Discussion: perl search and replace - search in first line and replance in 2nd line
Top Forums Shell Programming and Scripting perl search and replace - search in first line and replance in 2nd line Post 302493947 by durden_tyler on Friday 4th of February 2011 09:37:33 AM
Old 02-04-2011
Code:
$
$
$ # show the contents of the data file called "f4"
$
$ cat f4
tmp,123 --- if match tmp,??? then replace below line
,10:1 --- replace as ,10:50
abc,666
,10:1
tmp,111 --- if match tmp,??? then replace below line
,10:1 --- replace as ,10:50
tmp,123 --- if match tmp,??? then replace below line
,10:1 --- replace as ,10:50
aaa,666
,10:1 -- do not replace as above line is not matching "tmp,???"
,10:1 -- do not replace as above line is not matching "tmp,???"
$
$
$ # run the Perl one-liner that processes the data in the file "f4"
$
$ perl -plne 'if(/^tmp,\d{3}/) {$x=1} elsif($x) {$_=",10:50"; $x=0}' f4
tmp,123 --- if match tmp,??? then replace below line
,10:50
abc,666
,10:1
tmp,111 --- if match tmp,??? then replace below line
,10:50
tmp,123 --- if match tmp,??? then replace below line
,10:50
aaa,666
,10:1 -- do not replace as above line is not matching "tmp,???"
,10:1 -- do not replace as above line is not matching "tmp,???"
$
$

tyler_durden
 

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LEARN ABOUT DEBIAN

setmaillist

setmaillist(1)						      General Commands Manual						    setmaillist(1)

NAME

       setmaillist - create a binary mailing list

SYNOPSIS

       setmaillist bin tmp

DESCRIPTION

       setmaillist reads a mailing list from its standard input.

       setmaillist writes the mailing list in a binary format to tmp; it then moves tmp to bin.  tmp and bin must be on the same filesystem.

       If there is a problem creating tmp, setmaillist complains and leaves bin alone.

       The binary mailing list format is portable across machines.

       setmaillist always creates bin world-readable.

MAILING LIST FORMAT

       The mailing list read by setmaillist is a series of lines.  NUL bytes are not allowed.

       If a line begins with a dot or slash, setmaillist takes the entire line as an include file name.

       If  a line begins with an ampersand, setmaillist takes the rest of the line as a recipient address.  If a line begins with a letter or num-
       ber, setmaillist takes the entire line as a recipient address.  Each recipient address must include a fully qualified domain name.  Recipi-
       ent addresses longer than 800 bytes are not allowed.

       setmaillist ignores blank lines and lines beginning with #.  It also ignores spaces and tabs at the ends of lines.

       For example,

	  god@heaven.af.mil
	  djb@silverton.berkeley.edu

       is a mailing list with two addresses.

SEE ALSO

       setforward(1), newinclude(1), printmaillist(1)

																    setmaillist(1)
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