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Shell Programming and Scripting
Get 20 lines above string found, and 35 below string
Post 302712565 by itkamaraj on Tuesday 9th of October 2012 10:01:06 AM
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LEARN ABOUT CENTOS
look
LOOK(1) User Commands LOOK(1) NAME
look - display lines beginning with a given string SYNOPSIS
look [options] string [file] DESCRIPTION
The look utility displays any lines in file which contain string. As look performs a binary search, the lines in file must be sorted (where sort(1) got the same options -d and/or -f that look is invoked with). If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic characters is ignored. OPTIONS
-a, --alternative Use the alternative dictionary file. -d, --alphanum Use normal dictionary character set and order, i.e. only alphanumeric characters are compared. (This is on by default if no file is specified.) -f, --ignore-case Ignore the case of alphabetic characters. (This is on by default if no file is specified.) -t, --terminate character Specify a string termination character, i.e. only the characters in string up to and including the first occurrence of character are compared. -h, --help Display help text and exit. -V, --version Output version information and exit. The look utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred. EXAMPLE
sort -d /etc/passwd -o /tmp/look.dict look -t: root:foobar /tmp/look.dict FILES
/usr/share/dict/words the dictionary /usr/share/dict/web2 the alternative dictionary SEE ALSO
grep(1), sort(1) COMPATIBILITY
The original manual page stated that tabs and blank characters participated in comparisons when the alphanum option was specified. This was incorrect, and the current man page matches the historic implementation. HISTORY
The look utility appeared in Version 7 AT&T Unix. AVAILABILITY
The look command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux June 2011 LOOK(1)