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suspend and ||


From: esoriano
Subject: suspend and ||
Date: Fri, 21 Sep 2018 13:49:21 +0200

According to the manual:

(I)  Typing the suspend character (typically ^Z, Control-Z) 
     while a process is running causes that process to be
     stopped and returns control to bash.

(II) An OR list has the form

              command1 || command2

     command2  is executed if and only if command1
     returns a non-zero exit status.  The return status of
     AND and OR lists is the exit status of the last 
     command executed in the list.

In the following example:

address@hidden:~$ sleep 10 || echo hey
^Z
[5]+  Stopped                 sleep 10
hey
address@hidden:~$ 

there are two different issues:

(I) echo is executed when sleep is suspended, i.e., command2 is 
   executed before command1 exits.

(II) the exit status of command1 (when the job is resumed) will
   be 0 and command2 is (was) executed.

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-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib  -Wdate-time 
-D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/build/bash-vEMnMR/bash-4.4.18=. 
-fstack-protector-strong -Wformat -Werror=format-security -Wall 
-Wno-parentheses -Wno-format-security
uname output: Linux omac 4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.4
Patch Level: 19
Release Status: release

Description:
        [Detailed description of the problem, suggestion, or complaint.]

Repeat-By:
        [Describe the sequence of events that causes the problem
        to occur.]

Fix:
        [Description of how to fix the problem.  If you don't know a
        fix for the problem, don't include this section.]



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