Detecting unused variables... Post: 302973097

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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

05-14-2016

Registered User

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

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LEARN ABOUT DEBIAN

mincinfo

MINCINFO(1)							 MINC User's Guide						       MINCINFO(1)

NAME

       mincinfo - print out specified information about a minc file

SYNOPSIS

       mincinfo [<options>] <file> [<file> ...]

DESCRIPTION

       mincinfo  will  print out either a general description of a minc file (type, sign and range of data, plus a brief description of dimensions
       and their order), or specific information about dimensions, variables or attributes in the file. This program can be very useful for build-
       ing shell scripts that access minc files.

       All  information  given	by mincinfo is presented as read from the file with no transformation.	This means that start and step values, for
       example, are not in the world coordinate system.  To display the start values for a file in world coordinates, use voxeltoworld.

OPTIONS

       Note that options can be specified in abbreviated form (as long as they are unique) and can be given anywhere on the command line.   Dimen-
       sions, variables and attributes are all specified by name.  Attributes are specified by variable:attribute where variable can be omitted to
       specify global attributes. More than one option can be specified, in which case the return value from each option is printed on a  separate
       line (-image_info prints on many lines) in the order of the options on the command line.

       -image_info
	      Print  out the default general information about the file. This information includes the type, sign and range of the pixel data, the
	      order of the dimensions, and a list of dimensions giving name, length, start and step for each one.

       -dimnames
	      Print out a space-separated list of the dimensions in the file.

       -varnames
	      Print out a space-separated list of the variables in the file.

       -dimlength dimension
	      Print the length of the specified dimension.

       -vartype variable
	      Print the type of the variable.

       -vardims variable
	      Print a space-separated list of the dimensions that subscript the variable (in C order).

       -varatts variable
	      Print a space-separated list of the attribute names for the specified variable.

       -varvalues variable
	      Print a newline-separated list of the values of the specified variable.

       -atttype variable:attribute
	      Print out the type of the specified attribute.

       -attvalue variable:attribute
	      Print out a space-separated list of the values of the specified attribute.

       -error_string string
	      Specifies a string to print out if an error occurs. This will cause the program to exit with normal status. The default is to  print
	      an appropriate error message and exit with an error status.

       -help  Print summary of command-line options and abort.

       -version
	      Print the program's version number and exit.

EXAMPLES

       Print out standard information about a minc file.

	      mincinfo file.mnc

       Print out contents of global history attribute.

	      mincinfo file.mnc -attvalue :history

       Print out step value for x dimension, setting the default value to 1.

	      mincinfo file.mnc -attvalue xspace:step -error 1

       Print out the step values for x, y and z, setting the default value to 1.

	      mincinfo file.mnc -error 1 
		   -attvalue xspace:step 
		   -attvalue yspace:step 
		   -attvalue zspace:step

       Print out the names of the dimensions subscripting the image variable.

		   mincinfo file.mnc -vardims image

AUTHOR

       Peter Neelin

COPYRIGHTS

       Copyright (C) 1993 by Peter Neelin

SEE ALSO

       voxeltoworld(1)

							   $Date: 2004-05-20 21:52:08 $ 					       MINCINFO(1)