On Apr 14, 2017, at 11:32 AM, Ernie Luzar <luzar...@gmail.com> wrote:
> Chuck Swiger wrote:
>> On Apr 14, 2017, at 6:47 AM, Ernie Luzar <luzar...@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.
> 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
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