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Full Discussion: conditional append one line in file.
Top Forums Shell Programming and Scripting conditional append one line in file. Post 302627469 by Scrutinizer on Friday 20th of April 2012 03:37:16 PM
Old 04-20-2012
Try an awkie:
Code:
awk 'END{ if(NR==1) print "No data" >> FILENAME }' file

--edit--
This should be more efficient, it only reads 2 lines of the file:
Code:
awk 'getline{exit} {close(FILENAME); print "No data" >> FILENAME }' infile

Last edited by Scrutinizer; 04-20-2012 at 04:46 PM..
 

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LEARN ABOUT REDHAT

vboxmode

vboxmode(1)						    Linux System Administration 					       vboxmode(1)

NAME

       vboxmode - detect format of isdn voice file

SYNOPSIS

       vboxmode [OPTION] [OPTION] [...] FILENAME

DESCRIPTION

       Vboxmode detects format of isdn voice files and au files (sun audio format).

OPTIONS

       -q, --quiet
	      Don't print information about the file, only detect format and return an error code.

       -h, --help
	      Show summary of options.

       -v, --version
	      Show version of program.

RETURN CODE

       The format of the file is returned as an error code:

       o      for .au files a value between 128 and 150
       o      for vbox files a value between 2 and 6
       o      for unknown format or errors 255

SEE ALSO

       autovbox(1), rmdtovbox(1), vboxtoau(1), vboxcnvt(1), vbox(5)

AUTHOR

       This manual page was written by Andreas Jellinghaus <aj@dungeon.inka.de>, for Debian GNU/Linux and isdn4linux.

ISDN 4 Linux 3.1pre4						    2000/09/15							       vboxmode(1)
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