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Full Discussion: how can I delete lines without actually going into the file
Top Forums Shell Programming and Scripting how can I delete lines without actually going into the file Post 17098 by thehoghunter on Monday 11th of March 2002 09:39:56 AM
Old 03-11-2002
You can use sed or awk because I don't believe there is any such command that will delete a line without creating a new file.

Simply - use grep -v and search for the specific line (as long as your grep statement is correct you will remove only that line). Send the output to a new temp file and then move it back to the original filename. If you try to use grep -v and send the output to the original file, you would be left with a 0 byte file.
thehoghunter
 

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LEARN ABOUT ULTRIX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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