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Using arrays in bash using strings to bash built-in true

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# 1  
Old 03-28-2012
Using arrays in bash using strings to bash built-in true
I have the following code and for some reason when I call the program using

Code:
/home/tcdata/tatsh/trunk/hstmy/bin/bash/raytrac.bash --cmod=jcdint.cmod

I get
Code:
hasArgument[usage] = 
hasArgument[usage] = true

Somehow the array element
Quote:
hasArgument[usage]
is returning
Quote:
true
even though I have not chosen the
Quote:
--usage
option.


Code:
#!/bin/bash

#--Initialization----------------------------------------------------------------------------------

# Recognize both the -n flag and backslashed escape sequences.
echo_style="both"

ierr=0
Dflt_rytrVblv="medium"
Dflt_vblevel=1
Dflt_shiftLen=3
Dflt_bdVblevel=1

vb_usrInputFlag=0

# --Read Command Line Arguments---------------------------------------------------------------------

# IFS is a special variable that controls splitting. We split on "|" and "=", not whitespace.
# "$*" will now become a string like a|b|c

# Split on | and =.  $* will insert the | itself when IFS="|", so we
# get back what we put in, except everything's now split on = too, i.e.
# "a b" "c" --option=file
# becomes
# "a b" "c" --option file


# Return IFS to its normal whitespace.

# Loop until all arguments are used up.
# Shift tosses the value of $1 and sets $1=$2, $2=$3, ...
# so doing this repeatedly will decrease the value of $# until
# we run out of arguments.

OLDIFS="$IFS"
IFS="|="                # IFS controls splitting. Split on "|" and "=", not whitespace.
set -- $*               # Set the positional parameters to the command line arguments.
IFS="$OLDIFS"

narg="$#"
opt_browseDir_flag=`echo "$*" | tr '' '' | awk '/BRWS/ {print 1}; ! /BRWS/ {print 0}'`
echo "\$* = $*"

echo "hasArgument[usage] = ${hasArgument[usage]}"

while [ "$#" -gt 0 ]
do

  case "$1" in

  "--"[rR][yY][tT][rR][pP][tT][hH]|\
  "--"[rR][yY][tT][rR]"-"[pP][[aA][tT][hH])
    shift               # Skip ahead one to the next argument.
    value[rytrPath]="${1}"
    hasArgument[rytrPath]=true
  ;;

  "--"[cC][mM][oO][dD]|\
  "--"[cC][mM][oO][dD]"-"[iI][fF][lL])
    shift
    value[cmodInfl]="${1}"
    hasArgument[cmodIfl]=true
  ;;

  "--"[sS][rR][cC][sS]|\
  "--"[sS][rR][cC][sS]"-"[iI][fF][lL])
    shift
    value[srcsInfl]="${1}"
    hasArgument[srcsIfl]=true
  ;;

  "--"[rR][cC][vV][sS]|\
  "--"[rR][cC][vV][sS]"-"[iI][fF][lL])
    shift
    value[rcvsInfl]="${1}"
    hasArgument[rcvsIfl]=true
  ;;

  "--"[pP][hH][sS][sS]|\
  "--"[pP][hH][aA][sS][eE][sS])
    shift
    value[phases]="${1}"
    hasArgument[phases]=true
  ;;

  "--"[vV][bB][lL][vV]|\
  "--"[vV][bB]"-"[lL][eE][vV][eE][lL])
    shift
    value[vblv]="${1}"
    hasArgument[vblv]=true
  ;;

  "--"[fF][mM][tT]|\
  "--"[fF][oO][rR][mM][aA][tT])
    shift
    value[fmt]="${1}"
    hasArgument[fmt]=true
  ;;

  "--"[dD][tT][aA][uU])
    shift
    value[dtau]="${1}"
    hasArgument[dtau]=true
  ;;

  "--"[bB][rR][aA][cC][dD]|\
  "--"[bB][rR][aA][cC]"-"[dD][iI][sS][tT])
    shift
    value[bracD]="${1}"
    hasArgument[bracD]=true
  ;;

  "--"[tT][wW][pP][tT][dD]|\
  "--"[tT][wW][pP][tT]"-"[dD][iI][sS][tT])
    shift
    value[twptD]="${1}"
    hasArgument[twptD]=true
  ;;

  "--"[tT][wW][pP][tT][iI][tT][mM][xX]|\
  "--"[tT][wW][pP][tT]"-"[iI][tT][mM][aA][xX])
    shift
    value[twptItmax]="${1}"
    hasArgument[twptItmx]=1
  ;;

  "--"[rR][aA][yY][sS]|\
  "--"[rR][aA][yY][sS]"-"[oO][fF][lL])
    shift
    value[raysOutfl]="${1}"
    hasArgument[raysOfl]=1
  ;;

  "--"[tT][rR][vV][tT]|\
  "--"[tT][rR][vV][tT]"-"[oO][fF][lL])
    shift
    value[trvtOutfl]="${1}"
    hasArgument[trvtOfl]=true
  ;;

  "--"[rR][yY][tT][rR]"-"[vV][bB]|\
  "--"[rR][yY][tT][rR]"-"[vV][bB][lL][vV])
    shift
    value[rytrVblv]="${1}"
    hasArgument[rytrVb]=true
  ;;

  "--"[pP][mM][fF][lL])
    shift
    value[pmfl]="${1}"
    hasArgument[pmfl]=true
  ;;

  "--"[rR][yY][tT][rR][cC][bB][gG]|\
  "--"[rR][yY][tT][rR][cC]"-"[bB][gG])
    hasArgument[rytrBg]=true
  ;;

  "--"[bB][dD][pP][tT][hH]|\
  "--"[bB][dD][iI][rR]"-"[pP][aA][tT][hH])
    value[bdPath]="${1}"
    hasArgument[bdPath]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD]"-"[cC][oO][lL][pP]|\
  "--"[bB][dD][iI][rR]"-"[cC][oO][lL][pP][oO][sS])
    hasArgument[bdColp]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][sS][rR][tT]|\
  "--"[bB][dD][iI][rR]"-"[sS][oO][rR][tT])
    shift
    value[bdsrt]="${1}"
    hasArgument[bdSrt]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][gG][rR][pP]|\
  "--"[bB][dD][iI][rR]"-"[gG][rR][oO][uU][pP])
    shift
    value[bdGrp]="${1}"
    hasArgument[bdGrp]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][A][L][L]|\
  "--"[bB][dD][iI][rR]"-"[A][L][L])
    hasArgument[bdAll]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][rR][yY][tT][rR]|\
  "--"[bB][dD][iI][rR]"-"[rR][yY][tT][rR])
    hasArgument[bdRytr]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][dD][rR][wW]|\
  "--"[bB][dD][iI][rR]"-"[dD][rR][wW])
    hasArgument[bdDrw]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][sS][mM][pP]|\
  "--"[bB][dD][iI][rR]"-"[sS][mM][pP])
    hasArgument[bdSmp]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][lL][oO][gG]|\
  "--"[bB][dD][iI][rR]"-"[lL][oO][gG])
    hasArgument[bdLog]=true
    hasArgument[bd]=true
  ;;

  "--"[bB][dD][mM][sS][fF]|\
  "--"[bB][dD][iI][rR]"-"[mM][sS][fF])
    hasArgument[bdMsf]=true
    hasArgument[bd]=true
  ;;

  "-"[vV][bB][lL][vV]|\
  "--"[vV][bB]"-"[lL][eE][vV][eE][lL])
    shift
    value[vbLv]="${1}"
    hasArgument[vblv]=true
  ;;

  "-q"|"--quiet")
    hasArgument[quiet]=true
    hasArgument[vb]=false
  ;;

  "-u"|"--usage")
    hasArgument[usage]=true
  ;;

  "-e"|"--examples")
    hasArgument[examples]=true
  ;;

  "-h"|"--help")
    hasArgument[help]=true
  ;;

  *)
    value[bdFileLst]="${value[bdFileLst]} ${1}"
    hasArgument[bdFileLst]=true
    hasArgument[bd]=true
  ;;

  esac

  shift                 # Skip ahead to the next argument

done

# --Print Header------------------------------------------------------------------------------------

allArgs="$*"

raytracProg="./raytrac.tcsh"
eg1="$raytracProg --cmodif"
eg2="$raytracProg --cmodif"
eg3="$raytracProg --cmodif"

echo "hasArgument[usage] = ${hasArgument[usage]}"

# 2  
Old 03-28-2012
BASH doesn't have boolean types. The existence of a program named 'true' doesn't change this.

BASH doesn't have associative arrays, either. You can't use words as array indexes.
# 3  
Old 03-28-2012
Quote:
Originally Posted by Corona688
BASH doesn't have boolean types. The existence of a program named 'true' doesn't change this.

BASH doesn't have associative arrays, either. You can't use words as array indexes.
That's a bit of a problem. Doing
Quote:
man bash
in section arrays, says that Bash provides one-dimensional indexed and associative array variables. Should work from bash 4.0 onward.

ksh should have associative arrays and can use the same logic. What would be the alternative to the true/false scheme I used. For single variables, the true/false should work. Or am I wrong in the conclusion. I tried it and did not encounter a problem.

---------- Post updated at 11:18 AM ---------- Previous update was at 10:37 AM ----------

This is funny

Code:
echo "HELLO"
hasArgument[mytest0]=0
hasArgument[mytest1]=1
hasArgument[mytest2]=2
echo "${hasArgument[mytest0]} ${hasArgument[mytest1]} ${hasArgument[mytest2]}"

This returns

Code:
HELLO
2 2 2

# 4  
Old 03-28-2012
If you only need your script to run in the 1% of the world that has a new enough version of bash, yes...

Try quoting your strings.

Code:
VAR['asdf']=1
echo "${VAR['asdf']}"

# 5  
Old 03-28-2012
Quote:
Originally Posted by Corona688
If you only need your script to run in the 1% of the world that has a new enough version of bash, yes...

Try quoting your strings.

Code:
VAR['asdf']=1
echo "${VAR['asdf']}"

What's the string quoting about?
# 6  
Old 03-28-2012
It works either way for me, but I doubt we have identical bash versions, try it, see if it works.
# 7  
Old 03-28-2012
Quote:
Originally Posted by Corona688
If you only need your script to run in the 1% of the world that has a new enough version of bash, yes...

Try quoting your strings.

Code:
VAR['asdf']=1
echo "${VAR['asdf']}"

How about ksh? Can I use associative arrays without worry about using them?

Can one do the following in bash?
Code:
false=0
true=1

It works but one has to define the array as associative using:
Code:
declare -A VAR

Last edited by kristinu; 03-28-2012 at 01:54 PM..
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