How do I run a script calling the system function in Linux with C programming?

Question

I have created a script that takes a file(FiletoModify.txt) and copy line by line everything it contains to a new txt file which I called it output.txt.My problem is that I want to call system to do the following in my code but it doesn't work.I'm a new in C programming and I'm making it clear that I can't see my mistake and I really need some help.Thank you

My code in my C program:

system("cd Desktop; chmod +x script.sh ; ./script.sh");

Here's the script code:

    #!/bin/bash
    while IFS= read -r line
    do
    echo "$line"
    echo -e "$line\n" >>output.txt

    done <"FiletoModify"

Even if it otherwise worked, this wouldn't copy your file faithfully -- it would convert \t to a tab character, for instance, or \n to an extra newline. Don't use echo -e (which is also non-POSIX); printf '%s\n' "$line" is your friend. — Charles Duffy
– Charles Duffy, Commented Dec 29, 2014 at 23:55
Beyond that... well, why use system() at all? You can call chdir(), chmod(), etc., from C -- which is faster and doesn't open you up to bugs like shellshock. — Charles Duffy
– Charles Duffy, Commented Dec 29, 2014 at 23:56
I only know the system function.I have also stored this script in my desktop.What else do you suggest me to do?.....If I use chmod() how can I pass the arguments? — Devilhorn
– Devilhorn, Commented Dec 29, 2014 at 23:57
Also, is the // in your original code? For a shebang to work, the #! need to be the literal first two characters of the file; you can't have anything else before them. — Charles Duffy
– Charles Duffy, Commented Dec 29, 2014 at 23:58

tel · Accepted Answer · 2014-12-30 00:10:15Z

1

Okay, so from your error message your problem is with the cd Desktop; part of your C program. Two possible fixes:

Delete cd Desktop; from your system call.
Run your C executable from a directory one level above Desktop (i.e. the directory which contains Desktop).

answered Dec 30, 2014 at 0:10

tel

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6 Comments

Devilhorn Over a year ago

sh: 1: ./script.sh: not found I did it but this is what a got from terminal!

tel Over a year ago

My previous comment was incorrect. Assuming that you're now running your C executable from one level above Desktop, make sure that there actually is a shell script named script.sh in your Desktop directory. The error you're getting would indicate that currently there isn't.

tel Over a year ago

Always believe your error messages. Try to address the problem they describe (they're usually accurate, if a bit stupid and hard to understand). Even if your program doesn't run, if your error message changes consider this to be progress.

Devilhorn Over a year ago

I have saved everything in Desktop but I haven't found a solution yet

tel Over a year ago

Your link points to my dropbox. You'll need to right click on your code and select "Copy public link" in order to get the correct link.

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