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Shell Programming and Scripting

xargs and gnuplot

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# 8  
Old 09-19-2009
Quote:
Originally Posted by cfajohnson

Read the Command Substitution section of your shell's man page.
Sweet! Thanks again. I don't write scripts often (obvious, huh?). I know many years ago I read various shell manuals from end-to-end but seems I have only needed I/O redirection for most (all) stuff in recent years. Completely forgot about command substitution. Now that I think about it, I feel (am) stupid for having to ask.
# 9  
Old 09-19-2009
Quote:
Originally Posted by paulianna2002
...
Thanks rubin. Unfortunately, the most efficient way to use gnuplot in this instance is to build one command file for all specified files and then pass that one command file to gnuplot. Doing them one by one with the "-n1 -p" options won't help me in this case.
Agreed, but the problem was originally stated differently[*].

[*]
Quote:
Originally Posted by paulianna2002
...
If I run 'myscript.sh file1.dat file2.dat', it works as expected and gnuplot waits for me to press the enter key before moving onto the next plot.

But, if I do something like 'ls file*.dat | xargs myscript.sh' gnuplot runs through all of the plots without waiting for me to press enter.

So, gnuplot is getting something from stdin effectively making my pause commands useless.
[-]


Quote:
Originally Posted by paulianna2002
Code:
cut -f2 masterlist | myscript.sh

This is a totally new element in the equation.

Glad you found a solution.
# 10  
Old 09-19-2009
Quote:
Originally Posted by rubin
Agreed, but the problem was originally stated differently[*].
Sorry, tried my best to explain. I thought the
Quote:
...creates a single gnuplot command file containing multiple records, one for each specified file
would have done the trick. Probably would have been helpful if I had mad the file contents example look like one individual file, maybe like
Code:
-----file begin-----
gnuplot commands for first .dat file
pause -1

gnuplot commands for second .dat file
pause -1

etc,etc,etc
-----file end-----



---------- Post updated at 08:15 PM ---------- Previous update was at 08:06 PM ----------
Quote:
Originally Posted by rubin
cut -f2 masterlist | myscript.sh
...
This is a totally new element in the equation.
Oh boy...now I am getting confused again. Don't

Code:
ls file*.dat | myscript.sh

and

cut -f2 masterlist | myscript.sh

both just give me a list of "stuff" that is piped to myscript.sh? What is new about using cut vs. ls?
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