Accepting command line arguments in bash


 
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# 1  
Accepting command line arguments in bash

I have this tcsh code that I want to convert to a bash script. Basically it accepts command line arguments supplied by the user and stores them, so they can be used to run a C++ program.

Code:
set arg_browseDir_inFileLst = ""
set allArgsUpCase = `echo "$*" | tr '[:lower:]' '[:upper:]'`
set opt_browseDir_flag = `echo $allArgsUpCase | awk '/BRWS/ {print 1}; ! /BRWS/ {print 0}'`

set narg = $#argv
while ($iarg < $narg)

  MATH iarg = $iarg + 1
  set arg = $argv[$iarg]
  set opt_usrInputFlag = `echo $arg | awk '/=/ {print 1}; ! /=/ {print 0}'`
  set opt = `echo $arg | awk 'BEGIN {FS="="} {print $1}' | tr '[:lower:]' '[:upper:]'`
  set par = `echo $arg | awk 'BEGIN {FS="="} {print $2}'`

  switch ($opt)

  # -- Mandatory Arguments -------------------------------------------------------------------------

  case "--NXZ":                        # Mandatory
  case "--NX-NZ":
    set arg_nxz = $par
    set opt_nxz = 1
    breaksw

  case "--VARP":
    set arg_varp = $par
    set opt_varp = 1
    breaksw

  # -- Optional Arguments --------------------------------------------------------------------------

  case "--DRWPTH":
  case "--TDARWIN-PATH":
    set arg_drwPath = $par
    set opt_drwPath = 1
    breaksw

  case "--BASEIF":
  case "--BASE-INFILE":
    set arg_baseInFile = $par
    set opt_baseInFile = 1
    breaksw

  case "-DATAIF":
  case "--DATA-INFILE":
    set arg_tdatInFile = $par
    set opt_tdatInFile = 1
    breaksw

  case "--CMODIF":
  case "--CMOD-INFILE":
    set arg_cmodInFile = $par
    set opt_cmodInFile = 1
    breaksw

  case "--CMODOF":
  case "--CMOD-OUTFILE":
    set arg_cmodOutFile = $par
    set opt_cmodOutFile = 1
    breaksw

  case "--RSTRIF":
  case "--RSTR-INFILE":
    set arg_rstrInFile = $par
    set opt_rstrInFile = 1
    breaksw

  case "--NPOP":
    set arg_npop = $par
    set opt_npop = 1
    breaksw

  case "--SG":
  case "--SIGMA":
    set arg_sigma = $par
    set opt_sigma = 1
    breaksw

  case "-DRW-V":
  case "-DRW-VERBOSE":
  case "-DRW-VRB-LEVEL":
  case "--TDARWIN-VERBOSITY-LEVEL":
    set arg_drwVrb = $par
    set opt_drwVrb = 1
    breaksw

 case "--BRWSDIR-CHECK":                       # Separates numbers from characters.
  case "--BRWSDIR-CHECK-COLPOS":
    set opt_browseDir_chkColPos = 1
    breaksw

  case "--BRWSDIR-SORT":
  case "--BRWSDIR-SORT-FIELDS":
    set arg_browseDir_sortPtn = $par
    set opt_browseDir_sortFlds = 1
    breaksw

  case "--BRWSDIR-GROUP":
  case "--BRWSDIR-GROUP-TABLE":
    set arg_browseDir_groupPtn = $par
    set opt_browseDir_groupTbl = 1
    breaksw

  case "--BRWSDIR-ALL":
  case "--BRWSDIR-ALL-FILES":
    set opt_browseDir_allFiles = 1
    breaksw

  case "--BRWSDIR-RAYTRAC":                      # Display files related to raytrac.
  case "--BRWSDIR-RAYTRAC-FILES":
    set opt_browseDir_raytracFiles = 1
    breaksw

  default:
    set arg_browseDir_inFileLst = "$arg_browseDir_inFileLst $arg"
    set opt_browseDir_inFileLst = 1
    breaksw

  endsw

end   # while

---------- Post updated at 08:54 AM ---------- Previous update was at 08:45 AM ----------

I am aware of getopts but do not think base can handle long options though.

Code:
#IF NO ARGUMENTS WERE PROVIDED
function USAGE ()
{
    echo ""
    echo "USAGE: "
    echo "    ineff.sh [-?dh]"
    echo ""
    echo "OPTIONS:"
    echo "    -d  date of logfiles (format: yyyymmdd)"
    echo "    -h  logfile (format: 12 or 1[2-4])"
    echo "    -?  this usage information"
    echo ""
    echo "EXAMPLE:"
    echo "    ineff.sh -d 20060801 -h 2[12]"
    echo ""
    exit $E_OPTERROR    # Exit and explain usage, if no argument(s) given.
}

#PROCESS ARGS
while getopts ":d:h:?" Option
do
    case $Option in
        d    ) DT=$OPTARG;;
        h    ) HR=$OPTARG;;
        ?    ) USAGE
               exit 0;;
        *    ) echo ""
               echo "Unimplemented option chosen."
               USAGE   # DEFAULT
    esac
done

# 2  
Here is a start, run through a basic converter script. There will undoubtedly be things that will need to be edited manually.

Code:
arg_browseDir_inFileLst=""
allArgsUpCase=`echo "$*" | tr '[:lower:]' '[:upper:]'`
opt_browseDir_flag=`echo $allArgsUpCase | awk '/BRWS/ {print 1}; ! /BRWS/ {print 0}'`

narg=$#
while (($iarg < $narg))

  (( iarg = $iarg + 1 ))
  arg=$argv[$iarg]
  opt_usrInputFlag=`echo $arg | awk '/=/ {print 1}; ! /=/ {print 0}'`
  opt=`echo $arg | awk 'BEGIN {FS="="} {print $1}' | tr '[:lower:]' '[:upper:]'`
  par=`echo $arg | awk 'BEGIN {FS="="} {print $2}'`

  case $opt in

  # -- Mandatory Arguments -------------------------------------------------------------------------

  "--NXZ":                        # Mandatory)
  "--NX-NZ")
    arg_nxz=$par
    opt_nxz=1
    ;;

  "--VARP")
    arg_varp=$par
    opt_varp=1
    ;;

  # -- Optional Arguments --------------------------------------------------------------------------

  "--DRWPTH")
  "--TDARWIN-PATH")
    arg_drwPath=$par
    opt_drwPath=1
    ;;

  "--BASEIF")
  "--BASE-INFILE")
    arg_baseInFile=$par
    opt_baseInFile=1
    ;;

  "-DATAIF")
  "--DATA-INFILE")
    arg_tdatInFile=$par
    opt_tdatInFile=1
    ;;

  "--CMODIF")
  "--CMOD-INFILE")
    arg_cmodInFile=$par
    opt_cmodInFile=1
    ;;

  "--CMODOF")
  "--CMOD-OUTFILE")
    arg_cmodOutFile=$par
    opt_cmodOutFile=1
    ;;

  "--RSTRIF")
  "--RSTR-INFILE")
    arg_rstrInFile=$par
    opt_rstrInFile=1
    ;;

  "--NPOP")
    arg_npop=$par
    opt_npop=1
    ;;

  "--SG")
  "--SIGMA")
    arg_sigma=$par
    opt_sigma=1
    ;;

  "-DRW-V")
  "-DRW-VERBOSE")
  "-DRW-VRB-LEVEL")
  "--TDARWIN-VERBOSITY-LEVEL")
    arg_drwVrb=$par
    opt_drwVrb=1
    ;;

 "--BRWSDIR-CHECK":                       # Separates numbers from characters.)
  "--BRWSDIR-CHECK-COLPOS")
    opt_browseDir_chkColPos=1
    ;;

  "--BRWSDIR-SORT")
  "--BRWSDIR-SORT-FIELDS")
    arg_browseDir_sortPtn=$par
    opt_browseDir_sortFlds=1
    ;;

  "--BRWSDIR-GROUP")
  "--BRWSDIR-GROUP-TABLE")
    arg_browseDir_groupPtn=$par
    opt_browseDir_groupTbl=1
    ;;

  "--BRWSDIR-ALL")
  "--BRWSDIR-ALL-FILES")
    opt_browseDir_allFiles=1
    ;;

  "--BRWSDIR-RAYTRAC":                      # Display files related to raytrac.)
  "--BRWSDIR-RAYTRAC-FILES")
    opt_browseDir_raytracFiles=1
    ;;

  *)
    arg_browseDir_inFileLst="$arg_browseDir_inFileLst $arg"
    opt_browseDir_inFileLst=1
    ;;

  esac

end   # while

Converted with csh2sh.pl by Olivier Aubert

---------- Post updated at 15:00 ---------- Previous update was at 14:59 ----------

getopts cannot handle long options. Only the very latest ksh93 can do this...

Last edited by Scrutinizer; 03-13-2012 at 11:07 AM..
This User Gave Thanks to Scrutinizer For This Post:
# 3  
I got csh2sh.pl by Olivier Aubert. How did you use it to create a bash file from a tcsh script?

Last edited by kristinu; 03-13-2012 at 11:22 AM..
# 4  
You would have to look, as I downloaded it some time ago, I do not recall where from. What does "csh2sh.pl" give in google?

I quickly changed this manually by the way:

Code:
narg=$#
while (($iarg < $narg))

  (( iarg = $iarg + 1 ))

the latter two statements are not shell but bash/ksh93

Last edited by Scrutinizer; 03-13-2012 at 11:57 AM..
# 5  
I converted my tcsh script using csh2sh-rca.pl

The converted file has as it's first line

Code:
#!/bin/sh

I am wondering whether the conversion create a sh rather than GNU Bourne-Again SHell which I can designate with .bash

I was going to replace it to

Code:
#!/bin/bash

# 6  
It will create a Bourne Shell script or maybe a POSIX shell script, but bash will have no trouble interpreting that, since it is a Bourne Shell derivative and POSIX compliant, so you should be able to change the shebang to bash.

Last edited by Scrutinizer; 03-13-2012 at 12:29 PM..
# 7  
In the bash conversion, the while statement is as follows

Code:
while (($iarg < $narg))
  .
  .
  .
done

However the bash while loop syntax is

Code:
while [ condition ]
do
   command1
   command2
   command3
done

Can you give me some clarification on this please?

---------- Post updated at 10:07 AM ---------- Previous update was at 09:37 AM ----------

I am also trying to do and if statement and getting problems:
Code:
if (($opt_usage -eq 1))
then
  ...
  ...
fi

 

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