How to use exit status of two commands in if statement ?


 
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# 8  
Old 02-06-2019
If you want to run two commands in different work directories, then you can use a (subshell)
Code:
if (cd otherdir && make ...) && grep ...
then

Or vice versa
Code:
if make ... && (cd otherdir && grep ...)
then

The sub shell is a fork of the main shell. It inherits the current work directory, but it won't return it. What it returns: the output (stdout and sterr) and the exit status (normally from the last command).
Also you can use
Code:
(cd otherdir; grep ...)

or
Code:
(
cd otherdir
grep ...
)

but in general it is safer to only continue if the cd was successful.

Here comes a demo that the sub shell is indeed a complete shell:
Code:
if (
  if cd otherdir; then
    make ...
  fi
) && grep ...
then


Last edited by MadeInGermany; 02-06-2019 at 05:21 PM..
This User Gave Thanks to MadeInGermany For This Post:
# 9  
Old 02-06-2019
Quote:
Originally Posted by Sekhar419
...

The problem is i want to ignore some erros in different parts of that big file, so i have divided them into small files and then renamed them according to the first line in the file (as you know from my other question) then i will remove the files which i don't want then i will search for the errors in the remaining parts that are created. i don't know yet which parts i should exclude that is why i have the comment as below ...
OK, starts to make some sense now. Knowing that you want to exclude certain parts of the log file, csplit and grep might not be the optimal choice. If you show some more details, a taylored solution based on sed, awk, perl, etc. might be possible.


Quote:
sorry i didn't know how to reply my replies are being smudged one after other quite confusing layout
What do you mean by "smudged"? I usually (not always, I confess) post and then proofread my post to eliminate the obvious nonsense I made.


EDIT: One more comment: As you can see, quite many people posted quite many remarks (to your other, related thread(s) as well) while obviously poking in the dark. Had you clearly described the problem, supplying representative sample input data and e.g. exclusion conditions for error types, you'd highly probably have a taylored overall solution by now. It usually pays back quickly to spend some decent time composing a decent specification!

Last edited by RudiC; 02-06-2019 at 06:11 PM..
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