Call a Perl script within a bash script and store the ouput in a .txt file


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Call a Perl script within a bash script and store the ouput in a .txt file
# 1  
Old 11-21-2013
Network Call a Perl script within a bash script and store the ouput in a .txt file

I'm attempting to write a bash script that will create a network between virtual machines. It accepts three arguments: an RSpec that describes the network topology, and two list of machines (servers and clients).
I have a (working) Perl script that I want to call. This Perl script takes an RSpec and finds the machine names and/or IP addresses, and prints them to the STDOUT.
What I want to happen is for the bash script to call the perl script (which is in a subdirectory), and pipe the output to a .txt file. Right now, I keep getting an error saying the perl script doesn't exist, though I am giving it the full pathname.
This is the bash script:
Code:
#!/bin/bash
case $# in
3) ;;
*) printf "Need three arguments!\n"
exit 1 ;;
esac perl "$HOME/Documents/begPerl/etIDs.plx" "$1" > "$HOME/Documents/ AllMachines.txt" || exit 1

The error I'm getting is:
Code:
Can't open perl script "/home/*****/Documents/begPerl/getIDs.plx": No such file or directory

If it helps any, I'm using ubuntu on a VirtualBox VM (physical machine is a MacBook Pro). (The starred out text was a folder containing my name...)
Any and all help (and explanations, too) would be greatly appreciated. I'm relatively new to both perl and bash (only been using these languages for a few months).
I am aware that there are other threads dealing with similar topics, but I could not find one that suited this problem specifically.

Last edited by mecaka; 11-21-2013 at 08:42 PM..
# 2  
Old 11-21-2013
I see no / in front of home there, which means it starts looking for 'home' in the current directory, not in the root folder.

Try ~/"rest of path" instead of $HOME
# 3  
Old 11-21-2013
Quote:
Originally Posted by Corona688
I see no / in front of home there, which means it starts looking for 'home' in the current directory, not in the root folder.

Try ~/"rest of path" instead of $HOME
Thank you, but this did not work. The error is exactly the same as before.
# 4  
Old 11-21-2013
Quote:
Originally Posted by mecaka
Thank you, but this did not work. The error is exactly the same as before.
Yeah. On many shells, cd ~ is treated as a synonym for cd $HOME, however cd ~logname (where logname is your login name) should work.
But the real issue is that $HOME has been set incorrectly; it should ALWAYS be an absolute pathname.

It looks like you may have accidentally removed the leading "/" from $HOME. If you log out and log back in and $HOME still does not start with a "/", you'll need to dig through your shell's initialization files and correct the line that sets HOME.

Until you find the problem, assuming your login name is mecaka, the following should get your current shell execution environment back to a reasonable state:
Code:
cd ~mecaka
HOME=$PWD
export HOME

# 5  
Old 11-21-2013
Quote:
Originally Posted by Don Cragun
Yeah. On many shells, cd ~ is treated as a synonym for cd $HOME, however cd ~logname (where logname is your login name) should work.
But the real issue is that $HOME has been set incorrectly; it should ALWAYS be an absolute pathname.

It looks like you may have accidentally removed the leading "/" from $HOME. If you log out and log back in and $HOME still does not start with a "/", you'll need to dig through your shell's initialization files and correct the line that sets HOME.

Until you find the problem, assuming your login name is mecaka, the following should get your current shell execution environment back to a reasonable state:
Code:
cd ~mecaka
HOME=$PWD
export HOME

I just went back and read my original post. I am not posting this from the browser on my VM, so I could not copy and paste... There is a backslash before home, and there has been the whole time. I apologize for this confusion. I will correct this in the original.

However, if this was not the issue, what is? The PWD is "/home/*****/Documents" (assuming this helps any...)
I must add, I don't know much about the behind-the-scenes workings of programming. There might be something quote-en-qoute "obvious" that I wouldn't have caught.

Last edited by mecaka; 11-21-2013 at 08:47 PM..
# 6  
Old 11-22-2013
Sometimes, 'file not found' can mean it can't find a library. Check that perl runs properly when you run it by hand.

But I suspect it really means what it says -- the file really, genuinely isn't there. Look very closely for typos.
This User Gave Thanks to Corona688 For This Post:
# 7  
Old 11-22-2013
Quote:
Originally Posted by Corona688
Sometimes, 'file not found' can mean it can't find a library. Check that perl runs properly when you run it by hand.

But I suspect it really means what it says -- the file really, genuinely isn't there. Look very closely for typos.
Wow... Yeah, the actual filename was "getIDs.plx", my code said "getIds.plx", and the code I posted didn't have the 'g'... Thanks for pointing that out! Smilie
This User Gave Thanks to mecaka For This Post:
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

Writing a UNIX shell script to call a C function and redirecting data to a .txt file

Hi, I am complete new to C programming and shell scripting. I just wrote a simple C code to calculate integral using trapezoid rule. I am prompting user to pass me No. of equally spaced points , N , upper and lower limit. My code looks as follows so far: #include<stdio.h> #include<string.h>... (2 Replies)
Discussion started by: bjhjh
2 Replies

2. Shell Programming and Scripting

Need Help: Shell script to call sql session with variables stored in .txt file

Hi, I need help in writing a shell script which can read data from a text file (Cancel_ID.txt) and then calls sqlplus session (Cancel.sql) with the first line parameter of the text file ("0322600453") till all rows are not completed. ... (4 Replies)
Discussion started by: Khan28
4 Replies

3. UNIX for Dummies Questions & Answers

Write pid and command name to a txt file while executing a bash script

Hi All, Just have a requirement, I am executing a bash shell script, my requirement is to catch the pid and job name to a txt file in the same directory, is there anyway to do it? please help me out. Regards Rahul ---------- Post updated at 08:42 AM ---------- Previous update was at... (2 Replies)
Discussion started by: rahulkalra9
2 Replies

4. Shell Programming and Scripting

How to call a bash command from within a perl script?

In a bash script, one can call a perl command in the following manner, where "myperlcommand" is a perl command. perl -e 'myperlcommand(arguments)' perl -e 'print("UUUU"x4)' Now, how can one call a bash command from within a perl script? (Suppose that mybashcommand is a bash... (1 Reply)
Discussion started by: LessNux
1 Replies

5. Shell Programming and Scripting

shell script to call perl script problems

Ok, don't ask me why, but all calls to perl must be called by a shell script. Its really not ideal, but its what I have to work with. Calling it isnt the issue, its passing in the arguments. I have about 1000 perl scripts to call by a shell script. Right now, I'm executing the shell script... (3 Replies)
Discussion started by: regexnub
3 Replies

6. Shell Programming and Scripting

bash script to sort a txt file

I am writing a script to write to and a sort txt file. After I sort the file I want to add 2 to each line of the file. My script thus far is #!/bin/bash cat > /ramdisk/home/stux/unsortedints.out COUNT=0 FILE =/ramdisk/home/stux/unsortedints.out for i in {1..100} do NUMBER = $ echo $NUMBER... (3 Replies)
Discussion started by: puttyirc
3 Replies

7. Shell Programming and Scripting

how to call a bash script using perl

Hi I m new to perl. I m trying to write a perl script that calls a bash script; does anyone have a script already that they can provide or help me out? Thanks a lot. (2 Replies)
Discussion started by: adnan786
2 Replies

8. Shell Programming and Scripting

Perl cgi script to call bash script?

Novice to perl here. I have created a simple web page in perl, with only one submit button. I would like to execute a bash script on the same server when this button is clicked on. Is this possible in perl? I have spent a few days researching this and am unable to find any useful information.... (0 Replies)
Discussion started by: pleonard
0 Replies

9. Shell Programming and Scripting

call shell script from perl cgi script problem

hi,, i have perl scipt with line : system('./try.sh $t $d $m'); in shell scipt try.sh i have the line: echo $1 its not printing value of $t that i hav passed..y is it so..i am running it from apache web server (2 Replies)
Discussion started by: raksha.s
2 Replies

10. Shell Programming and Scripting

Modify Perl script to work with txt - Permissions script

Hi I have this code, and i want work with a ls -shalR output in .txt What i need read to do this?? Where start? #!/usr/bin/perl # Allrights- A perl tool for making backups of file permissions # Copyright (C) 2005 Norbert Klein <norbert@acodedb.com> # This program is free... (1 Reply)
Discussion started by: joangopan
1 Replies
Login or Register to Ask a Question

Featured Tech Videos