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Full Discussion: find content from a file
Top Forums Shell Programming and Scripting find content from a file Post 302148131 by venkatesh_sasi on Friday 30th of November 2007 01:06:12 AM
Old 11-30-2007
Java

Hi,

I have a very similar requirement. I'm storing the passwords in a flat file, when ever the user updates the password, I'm planning to write the new password along with some other values and delete the old one. I thought of doing it using "grep -v". Can anybody help me out how to pass a variable from C program to unix command. In my previous post, I got a reply from bakunin saying to use sprintf(). I tried the below code.
Code:
main()
{
char v_unix[10];
sprintf(v_unix,"%s",argv[1]);
system("cat filename | grep -v v_test > filename2");
}

This didn't work. Help me to accomplish this.

Thanks & Regards,
Venkatesh.
 

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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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