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Full Discussion: extract a line from a file using the line number
Top Forums Shell Programming and Scripting extract a line from a file using the line number Post 302164860 by ashishdugar on Wednesday 6th of February 2008 05:12:44 AM
Old 02-06-2008
Quote:
Originally Posted by grandtheftander
Hello,
I am having trouble extracting a specific line from a file when the line number is known. My first attempt involved grep -n 'hi' (the word 'hi will always be there) to get the line number before the line that I actually want (line 4).
Extra Notes:
-I am working in a bash script.
-The file size is always variable, so I couldn't use head or tail.
#file that I am evaluating
Code:
hello
hey
hi
there <-line that i want
how
are
you 
doing


head -4 | awk '{ print $1 }' < filename | tail -1
 

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LEARN ABOUT DEBIAN

cabextract

CABEXTRACT(1)						      General Commands Manual						     CABEXTRACT(1)

NAME

       cabextract - program to extract files from Microsoft cabinet (.cab) archives

SYNOPSIS

       cabextract [-ddir] [-f] [-Fpattern] [-h] [-l] [-L] [-p] [-q] [-s] [-t] [-v]  cabinet files ...

DESCRIPTION

       cabextract  is  a  program that un-archives files in the Microsoft cabinet file format (.cab) or any binary file which contains an embedded
       cabinet file (frequently found in .exe files).

       cabextract will extract all files from all cabinet files specified on the command line.

       To extract a multi-part cabinet consisting of several files, only the first cabinet file needs to be given as an argument to cabextract	as
       it  will  automatically	look  for the remaining files. To prevent cabextract from extracting cabinet files you did not specify, use the -s
       option.

OPTIONS

       A summary of options is included below.

       -d dir Extracts all files into the directory dir.

       -f     When testing or extracting cabinet files, corrupted MSZIP blocks will be ignored. A warning will be printed  if  a  corrupted  MSZIP
	      block is encountered.

       -F pattern
	      Only  files with names that match the shell pattern pattern shall be listed, tested or extracted. On non-GNU systems, this match may
	      be case-sensitive.

       -h     Prints a page of help and exits.

       -l     Lists the contents of the given cabinet files, rather than extracting them.

       -L     When extracting cabinet files, makes each extracted file's name lowercase.

       -p     Files shall be extracted to standard output.

       -q     When extracting cabinet files, suppresses all messages except errors and warnings.

       -s     When testing, listing or extracting cabinets which span multiple files, only cabinet files given on the command line shall be used.

       -t     Tests the integrity of the cabinet. Files are decompressed, but not written to disk or standard output.  If  the	file  successfully
	      decompresses, the MD5 checksum of the file is printed.

       -v     If given alone on the command line, prints the version of cabextract and exits. Given with a list of cabinet files, it will list the
	      contents of the cabinet files.

AUTHOR

       This manual page was written by Stuart Caie <kyzer@4u.net>, based on the one written by Eric Sharkey <sharkey@debian.org>, for  the  Debian
       GNU/Linux system.

SEE ALSO

       lcab(1)

								 October 30, 2005						     CABEXTRACT(1)
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