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From: | James Caccese |
Subject: | Uxexpected complaint of "unbound variable" |
Date: | Tue, 5 May 2015 01:03:47 +0000 (UTC) |
GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)
,#! /bin/bash
set -u
exec {FD1}>tmp1.txt
declare -r FD1
echo "fd1: $FD1" # why does this work,
function f1() {
exec {FD2}>tmp2.txt
readonly FD2
echo "fd2: $FD2" # this work,
}
f1
function f2() {
exec {FD3}>tmp3.txt
echo "fd3: $FD3" # and even this work,
declare -r FD3
echo "fd3: $FD3" # when this complains: "FD3: unbound variable"?
}
f2
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