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unalias works weirdly inside an if-then block
From: |
Gabor Burjan |
Subject: |
unalias works weirdly inside an if-then block |
Date: |
Fri, 12 May 2017 14:33:06 +0200 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknown-linux-gnu'
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/local/sha$
uname output: Linux hostname 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31
14:07:41 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu
Bash Version: 4.4
Patch Level: 0
Release Status: release
Description:
unalias works weirdly inside an if-then block
Repeat-By:
By sourcing the code below in an interactive shell
I can reproduce the bug on vanilla 4.4 version,
on 4.3.46 (Ubuntu 16.04 default) and
on 4.2.46 (RHEL 7.1 default)
# Small code snippet to reproduce weird unalias functionality
# Call with "source scriptname" in a fresh *interactive* shell
touch /tmp/a /tmp/b
alias cp='cp -i'
if [[ 1 = 1 ]]; then
echo -n 'before unalias: '
alias | grep '^alias cp='
echo -e "(end of alias output)\n"
unalias cp
echo -n 'after unalias: '
alias | grep '^alias cp='
echo -e "(end of alias output)\n"
set -x
# This one will be interactive, but why?
cp /tmp/a /tmp/b
fi
# This one won't be interactive
cp /tmp/a /tmp/b
set +x