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Full Discussion: How to enter commands to the command prompt in a program
Top Forums Shell Programming and Scripting How to enter commands to the command prompt in a program Post 302427035 by freemoniez on Thursday 3rd of June 2010 03:57:59 PM
Old 06-03-2010
How to enter commands to the command prompt in a program
Hey,
So I'm trying to write a program in unix to automate a process for my astrophysics research.
Basically I want the program to prompt the user for some information and store the entered string of text as a variable. I know how to do this.

This is where I need help:
Now lets say I have a command that needs to be run in the command prompt, and not in the program. How can I do that?

So for example I run the program. The program asks for the location of a certain file. The user enters the location and the program saves this text as some variable ($location).
I need the program to send the following to the command prompt: dmkeypar $location
is that doable?

---------- Post updated at 03:36 PM ---------- Previous update was at 03:18 PM ----------

Maybe if I tell you why I need to do this it will make more sense.

I have a bunch of sets of files that I want to manipulate in a similar way. Specifically I'm taking chandra satellite data files, and applying certain transformations and corrections to them. To do this I've created a recipe of the commands in UNIX I use to apply a particular transformation.
The whole recipe is about a hundred steps long. I would like to write a program so I dont have to keep entering the commands by hand, and that I only have to enter the file names or occasionally a number, which will be stored as a variable, the variable will be inserted into the recipee text, and the recipe text (with the user inputted file name) will be "entered" into the command prompt instead of back into the program.

---------- Post updated at 03:57 PM ---------- Previous update was at 03:36 PM ----------

I will be able to write my whole program easily if I can write this simple program.

When you the run the program it as you for an input.
So far the program would look like this:

#!/bin/sh

echo "Enter Location: \c"
read location


But next I want the program to input "location" into the command prompt, as if I had just opened the terminal and entered the contents of "location"

If I can achieve this I can do my whole program, since the only change will be that instead of entering merely the variable into the command prompt it enters some prescripted scripted with the variable (determined by the user input) embedded into the text.

This is all doable right?
Thanks in advance, if I can get this program to work it will save me so much time and let me actually get to the real research...
 

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LEARN ABOUT LINUX

git-mergetool

GIT-MERGETOOL(1)						    Git Manual							  GIT-MERGETOOL(1)

NAME

       git-mergetool - Run merge conflict resolution tools to resolve merge conflicts

SYNOPSIS

       git mergetool [--tool=<tool>] [-y | --[no-]prompt] [<file>...]

DESCRIPTION

       Use git mergetool to run one of several merge utilities to resolve merge conflicts. It is typically run after git merge.

       If one or more <file> parameters are given, the merge tool program will be run to resolve differences on each file (skipping those without
       conflicts). Specifying a directory will include all unresolved files in that path. If no <file> names are specified, git mergetool will run
       the merge tool program on every file with merge conflicts.

OPTIONS

       -t <tool>, --tool=<tool>
	   Use the merge resolution program specified by <tool>. Valid values include emerge, gvimdiff, kdiff3, meld, vimdiff, and tortoisemerge.
	   Run git mergetool --tool-help for the list of valid <tool> settings.

	   If a merge resolution program is not specified, git mergetool will use the configuration variable merge.tool. If the configuration
	   variable merge.tool is not set, git mergetool will pick a suitable default.

	   You can explicitly provide a full path to the tool by setting the configuration variable mergetool.<tool>.path. For example, you can
	   configure the absolute path to kdiff3 by setting mergetool.kdiff3.path. Otherwise, git mergetool assumes the tool is available in PATH.

	   Instead of running one of the known merge tool programs, git mergetool can be customized to run an alternative program by specifying
	   the command line to invoke in a configuration variable mergetool.<tool>.cmd.

	   When git mergetool is invoked with this tool (either through the -t or --tool option or the merge.tool configuration variable) the
	   configured command line will be invoked with $BASE set to the name of a temporary file containing the common base for the merge, if
	   available; $LOCAL set to the name of a temporary file containing the contents of the file on the current branch; $REMOTE set to the
	   name of a temporary file containing the contents of the file to be merged, and $MERGED set to the name of the file to which the merge
	   tool should write the result of the merge resolution.

	   If the custom merge tool correctly indicates the success of a merge resolution with its exit code, then the configuration variable
	   mergetool.<tool>.trustExitCode can be set to true. Otherwise, git mergetool will prompt the user to indicate the success of the
	   resolution after the custom tool has exited.

       --tool-help
	   Print a list of merge tools that may be used with --tool.

       -y, --no-prompt
	   Don't prompt before each invocation of the merge resolution program.

       --prompt
	   Prompt before each invocation of the merge resolution program. This is the default behaviour; the option is provided to override any
	   configuration settings.

TEMPORARY FILES

       git mergetool creates *.orig backup files while resolving merges. These are safe to remove once a file has been merged and its git
       mergetool session has completed.

       Setting the mergetool.keepBackup configuration variable to false causes git mergetool to automatically remove the backup as files are
       successfully merged.

GIT

       Part of the git(1) suite

Git 1.8.5.3							    01/14/2014							  GIT-MERGETOOL(1)
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