csh script help
Chuck Swiger
cswiger at mac.com
Fri Apr 14 18:58:58 UTC 2017
Hi--
On Apr 14, 2017, at 11:32 AM, Ernie Luzar <luzar722 at gmail.com> wrote:
> Chuck Swiger wrote:
>> On Apr 14, 2017, at 6:47 AM, Ernie Luzar <luzar722 at gmail.com> wrote:
>>> To aid in debugging the script I'm writing, I place "echo" commands throughout so I can kind of have a trace of the logic as different conditions are processed. Normally I just delete these "echo" commands after I get the script working.
>>
>> Since you've gotten an answer to the question you asked, let me only note that both sh and csh support the -x flag, which causes the shell to echo the commands as it runs. This is extremely helpful for debugging.
>> Regards,
>
> Where is the this -x flag coded at? Do the executed lines roll fast off the screen or can I slowly step through the script a line at a time?
>
> Thanks for this bit of information.
You can either run the script via "/bin/sh -x myscript.sh" and similar for csh, or you can add -x to the first line of the script, commonly "#! /bin/sh" and invoke it directly via ./myscript.sh.
The lines are displayed as rapidly as the shell runs.
If running natively on FreeBSD, most people would use a terminal emulator like xterm which provides scrollback. You could also run under nohup, which will save output to a file named nohup.out, unless you redirect output somewhere else.
Regards,
--
-Chuck
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