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Top Forums UNIX for Advanced & Expert Users Detecting unused variables... Post 302973097 by drl on Saturday 14th of May 2016 07:29:14 AM
Old 05-14-2016
Hi.

Found in Debian repository (noted by Is there a static analysis tool like Lint or Perl::Critic for shell scripts? - Stack Overflow ):
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate static shell checking.
# If not in repository, see:
# http://hackage.haskell.org/package/ShellCheck
# ( Verified 2016.05.14 )

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C shellcheck

FILE=${1-data1}

pl " Input data file $FILE:"
cat $FILE

pl " Results:"
shellcheck $FILE

exit 0

producing:
Code:
$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.4 (jessie) 
bash GNU bash 4.3.30
ShellCheck - shell script analysis tool

-----
 Input data file data1:
#!/bin/bash

# @(#) example1.sh      Demonstrate catching of errors.

v0=7

for i in 1 2 3
do
  (( l=j+1 ))
  printf " Hello, world (from script)"
done

if [ $v1 ]
then
  echo ' My fault'
fi

exit $n

-----
 Results:

In data1 line 5:
v0=7
^-- SC2034: v0 appears unused. Verify it or export it.


In data1 line 7:
for i in 1 2 3
^-- SC2034: i appears unused. Verify it or export it.


In data1 line 13:
if [ $v1 ]
     ^-- SC2086: Double quote to prevent globbing and word splitting.


In data1 line 18:
exit $n
     ^-- SC2086: Double quote to prevent globbing and word splitting.

Best wishes ... cheers, drl
These 4 Users Gave Thanks to drl For This Post:
 

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WMANAGER-LOOP(1)					    BSD General Commands Manual 					  WMANAGER-LOOP(1)

NAME
wmanager-loop -- loop running window managers chosen with wmanager SYNOPSIS
wmanager-loop [OPTIONS ...] DESCRIPTION
The wmanager-loop program starts either the window manager specified by the WM variable or the first window manager listed in ~/.wmanagerrc (or an X terminal emulator if none), and when it exits, runs wmanager(1) to prompt the user for the next window manager. It loops doing this until the user chooses ``Exit this session'' in wmanager(1). Any options given to wmanager-loop will be passed on to wmanager(1). If the WM environment variable is set, the wmanager-loop program tries to interpret it as a window manager specification in the following ways in the specified order: o a full path to an executable file to run as the window manager; o the name of a window manager listed in the /.wmanagerrc file; e.g. ``fluxbox'' would match the following line: fluxbox=/usr/bin/startfluxbox o the program name of a window manager listed in the /.wmanagerrc file; e.g. ``startfluxbox'' would match the above example. o the start of such a program name; e.g. ``start'' would match the above example. o the end of such a program name; e.g. ``box'' would match the above example. If the WM variable is set and there is more than one line in ~/.wmanagerrc that matches the specification, wmanager-loop will exit with an error message. As mentioned above, if no window manager is specified in the WM environment variable or found in the ~/.wmanagerrc file, the wmanager-loop program attempts to start an X terminal emulator. If the WMTERM environment variable is set, the wmanager-loop program uses it as the path to the emulator. Otherwise it searches the user's path for a program named ``x-terminal-emulator'', ``urxvt'', ``rxvt'', or ``xterm'' in this order, and starts the first one found using its full path. If none of the common terminal emulators on the above list is found, the wmanager-loop program just runs ``xterm'' in the hope that something will come up on the user's display. ENVIRONMENT
The wmanager-loop program uses the following environment variables: WM The name, path, or partial path to the first window manager to execute. WMTERM The name of the X terminal emulator to execute if no window manager could be found in the ~/.wmanagerrc file. If not specified, the wmanager-loop program searches the user's path as described above. EXAMPLE
To start using wmanager-loop, create a ~/.wmanagerrc file - generally with wmanagerrc-update(1) - and add something like the following at the end of your ~/.xsession file: exec wmanager-loop -geometry +570+585 SEE ALSO
wmanager(1), wmanagerrc-update(1) HISTORY
The wmanager-loop program was written by Tommi Virtanen in 2000 and later modified by Peter Pentchev. This manual page was originally writ- ten in perldoc format by Tommi Virtanen in 2000, and converted to mdoc format and updated by Peter Pentchev in 2008. AUTHORS
Tommi Virtanen <tv@debian.org> Peter Pentchev <roam@ringlet.net> BSD
September 8, 2009 BSD
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