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Top Forums Shell Programming and Scripting how to find the shortest line which containing a key string? Post 302603637 by sunnydanniel on Thursday 1st of March 2012 02:31:40 PM
Old 03-01-2012
Quote:
Originally Posted by Corona688
Code:
awk '/M0271857/ && ((!L) || (length(L)>length($0))) { L=$0 } END { print L }' datafile

Meaning:

Code:
/M0271857/ # for all lines where your string matches
&& ((!L) || (length(L)>length($0))) # ...and L is undefined or longer than the line
{ L=$0 } # Set L to the entire line
END { print L } # After all lines are processed, print the shortest one found

Hi, thank you for the reply.
i found that if there are two lines which are both the shortest, nothing is returned. is there a way to solve this?
thanks!
 

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PR(1)							      General Commands Manual							     PR(1)

NAME
pr - print file SYNOPSIS
pr [ option ] ... [ file ] ... DESCRIPTION
Pr produces a printed listing of one or more files. The output is separated into pages headed by a date, the name of the file or a speci- fied header, and the page number. If there are no file arguments, pr prints its standard input. Options apply to all following files but may be reset between files: -n Produce n-column output. +n Begin printing with page n. -h Take the next argument as a page header. -wn For purposes of multi-column output, take the width of the page to be n characters instead of the default 72. -f Use formfeeds instead of newlines to separate pages. A formfeed is assumed to use up two blank lines at the top of a page. (Thus this option does not affect the effective page length.) -ln Take the length of the page to be n lines instead of the default 66. -t Do not print the 5-line header or the 5-line trailer normally supplied for each page. -sc Separate columns by the single character c instead of by the appropriate amount of white space. A missing c is taken to be a tab. -m Print all files simultaneously, each in one column, Inter-terminal messages via write(1) are forbidden during a pr. FILES
/dev/tty? to suspend messages. SEE ALSO
cat(1) DIAGNOSTICS
There are no diagnostics when pr is printing on a terminal. 4th Berkeley Distribution April 29, 1985 PR(1)
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