[Solved] How to refer to input file in code? Post: 302731183

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Top Forums UNIX for Dummies Questions & Answers [Solved] How to refer to input file in code? Post 302731183 by legato22 on Wednesday 14th of November 2012 11:26:55 AM

11-14-2012

Registered User

Quote:

Originally Posted by alister

Positional parameters is the term you need to look for when searching. They should be documented in your shell's manual page. They are shell variables (aka parameters) of the form $1, $2 ... $N, where N is the number of arguments with which the script was called. You'll also want to learn about the related special variables $* and $@.

Regards,
Alister

Thanks! Finally got the right search term. After a little more searching, fyi for posterity, i set the variables with:

DIR=`dirname $1`
INPUT=`basename $1`

I was having problems before too because I didn't realize that there could be no spaces when setting variables!
Works now, thanks again.

EDIT: Not working... sort of pissing me off. I did this the first time, and it returned the dirname and basename of the file the script was running on with $1, but now it won't anymore. dirname is empty and it just returns "usage:dirname path"

EDIT: And it works again...I realized that getting the dirname from $1 or $0 the way I am doing it gets problems if any of the folders in the path have spaces in them because i assume that it takes the space for a new "field"... Might be using improper terminology, but $1 might become $2 for example. My solution was to remove spaces from folder names... Anyone know how to do this otherwise so that there won't be a problem?

Last edited by legato22; 11-14-2012 at 02:44 PM..

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LEARN ABOUT SUNOS

basename

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)