What is the effect of this statement in a shell script?
set -o errtrace
From the manual:
errtrace Same as -E.
-E If set, any trap on ERR is inherited by shell functions, command substitutions, and commands executed in a sub‐ shell environment. The ERR trap is normally not inher‐ ited in such cases.
When errtrace
is enabled, the ERR trap is also triggered when the error (a command returning a nonzero code) occurs inside a function or a subshell. Another way to put it is that the context of a function or a subshell does not inherit the ERR trap unless errtrace
is enabled.
#!/bin/bash
set -o errtrace
function x {
echo "X begins."
false
echo "X ends."
}
function y {
echo "Y begins."
false
echo "Y ends."
}
trap 'echo "ERR trap called in ${FUNCNAME-main context}."' ERR
x
y
false
true
Output:
X begins.
ERR trap called in x.
X ends.
Y begins.
ERR trap called in y.
Y ends.
ERR trap called in main context.
When errtrace
is not enabled:
X begins.
X ends.
Y begins.
Y ends.
ERR trap called in main context.
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