[TynesideLUG] Using bash with the -e option

[Ian Bruntlett]

Hi,

I've been told (on accu-general) that running a bash script which contains
this command:-
set -e

Will, normally be useful because if a command returns a non-zero exit code
it is treated as an error  and the script is automatically exited.

That is fine but there is a subset of commands (such as grep) that use exit
code slightly differently. For example, grep:-

Normally  the  exit  status is 0 if a line is selected, 1 if no lines were
selected, and 2 if an error occurred.  However, if the -q  or  --quiet  or
--silent  is  used and a line is selected, the exit status is 0 even if an
error occurred.

HTH,


Ian

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