#!/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

$ ./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.