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Top Forums UNIX for Dummies Questions & Answers [Solved] How to refer to input file in code? Post 302731151 by legato22 on Wednesday 14th of November 2012 10:39:50 AM
Old 11-14-2012
[Solved] How to refer to input file in code?

This may be a dumb question, but googling is not giving me an answer. I'm trying to figure out how to refer to an input file in my code.

Lets say i run a script in bash:

"sh shellscript.sh inputfile"
(Inputfile will be variable...whatever file i run the script on)

I wanted to make variables like "DIR=dirname inputfile" and "BASE = basename inputfile" so that I can use those to make subsequent files based off of the basename and put them in directories based on the dirname rather than having to cd to the directory to run the script and keep the output files in that folder. The problem is that I don't know how to refer to the inputfile to initially set these variables.

Also, if I set these variables at the beginning of the whole shell script, they will stay throughout for all of the other commands I am performing, right?
 

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basename(1)							   User Commands						       basename(1)

NAME
basename, dirname - deliver portions of path names SYNOPSIS
/usr/bin/basename string [suffix] /usr/xpg4/bin/basename string [suffix] dirname string DESCRIPTION
The basename utility deletes any prefix ending in / and the suffix (if present in string) from string, and prints the result on the stan- dard output. It is normally used inside substitution marks (``) within shell procedures. /usr/bin The suffix is a pattern defined on the expr(1) manual page. /usr/xpg4/bin The suffix is a string with no special significance attached to any of the characters it contains. The dirname utility delivers all but the last level of the path name in string. EXAMPLES
Example 1: Setting environment variables The following example, invoked with the argument /home/sms/personal/mail sets the environment variable NAME to the file named mail and the environment variable MYMAILPATH to the string /home/sms/personal: example% NAME=`basename $HOME/personal/mail` example% MYMAILPATH=`dirname $HOME/personal/mail` Example 2: Compiling a file and moving the output This shell procedure, invoked with the argument /usr/src/bin/cat.c, compiles the named file and moves the output to cat in the current directory: example% cc $1 example% mv a.out `basename $1 .c` ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of basename and dirname: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ /usr/xpg4/bin +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWxcu4 | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
expr(1), basename(3C), attributes(5), environ(5), standards(5) SunOS 5.10 18 Mar 1997 basename(1)
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