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Top Forums UNIX for Dummies Questions & Answers I am not able to use variables in system command in a C program Post 302760455 by dhanda2601 on Thursday 24th of January 2013 04:37:39 AM
Old 01-24-2013
Linux I am not able to use variables in system command in a C program

this method is not working.I am having a problem to use variables in system command. i cannot use the variables in system command.
this how i was did
Code:
system("whereis command");

this method works very fine. but, i want use the commands as variable.
that means i want only pass the variables.
like this
Code:
scanf("%s",variable);
system("whereis variable");

but,

Last edited by Scott; 01-24-2013 at 07:08 AM.. Reason: Code tags
 

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WHEREIS(1)							   User Commands							WHEREIS(1)

NAME
whereis - locate the binary, source, and manual page files for a command SYNOPSIS
whereis [options] [-BMS directory... -f] name... DESCRIPTION
whereis locates the binary, source and manual files for the specified command names. The supplied names are first stripped of leading pathname components and any (single) trailing extension of the form .ext (for example: .c) Prefixes of s. resulting from use of source code control are also dealt with. whereis then attempts to locate the desired program in the standard Linux places, and in the places specified by $PATH and $MANPATH. OPTIONS
-b Search only for binaries. -m Search only for manuals. -s Search only for sources. -u Only show the command names that have unusual entries. A command is said to be unusual if it does not have just one entry of each explicitly requested type. Thus 'whereis -m -u *' asks for those files in the current directory which have no documentation file, or more than one. -B list Limit the places where whereis searches for binaries, by a whitespace-separated list of directories. -M list Limit the places where whereis searches for manuals, by a whitespace-separated list of directories. -S list Limit the places where whereis searches for sources, by a whitespace-separated list of directories. -f Terminates the directory list and signals the start of filenames. It must be used when any of the -B, -M, or -S options is used. -l Output list of effective lookup paths the whereis is using. When non of -B, -M, or -S is specified the option will out hard coded paths that the command was able to find on system. EXAMPLE
To find all files in /usr/bin which are not documented in /usr/man/man1 or have no source in /usr/src: $ cd /usr/bin $ whereis -u -ms -M /usr/man/man1 -S /usr/src -f * FILE SEARCH PATHS
By default whereis tries to find files from hard-coded paths, which are defined with glob patterns. The command attempst to use contents of $PATH and $MANPATH environment variables as default search path. The easiest way to know what paths are in use is to add -l listing option. Effects of the -B, -M, and -S are display with -l. AVAILABILITY
The whereis command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils /util-linux/>. util-linux March 2013 WHEREIS(1)
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