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Full Discussion: Looping structure to make up for lack of bash GOTO
Top Forums Shell Programming and Scripting Looping structure to make up for lack of bash GOTO Post 302904208 by LMHmedchem on Monday 2nd of June 2014 10:25:03 PM
Old 06-02-2014
Looping structure to make up for lack of bash GOTO
Hello,

I am re-processing some files when a specific condition is met. The condition is read from the filename. Since files may need to be re-processed a number of times before they no longer meet the condition, I need to know when to stop re-processing. I am having trouble visualizing the proper control structure. What I had in mind was something like,
Code:
1: look through the list of files and find those that meet the re-process condition
2: increment a counter to track the number of files that meet the contrition
3: re-process files that meet the condition
4: GOTO 1 unless the counter==0

The above code would nicely keep looping until there were no compliment files found. The somewhat annoying lack of a GOTO statement makes takes this option off of the table, so I need a replacement.

I guess that some kind of a while loop would be the best alternative, but I don't know what bash has to offer for loops other than a do loop.

Can someone make a suggestion for this. I can post more code if that would help.

---------- Post updated at 10:25 PM ---------- Previous update was at 08:44 PM ----------

At the moment, I am trying something like this,
Code:
# zero stop condition
STOP=0

 # keep looping until stop condition is met
 while [ "$STOP" -ne "1" ] 
 do

   ###create list of current files
   $FILES

   ### check list for re-process condition and add filename to array
   for FILENAME in $FILES
   do
      if [ "$VALUE1" == "$VALUE2" ]; then
         FILENAMES_TO_PROCESS=("${FILENAMES_TO_PROCESS[@]}" "$FILENAME")
      fi
   done

   ### check if any files were found to re-process
   # if no files are found that meet the re-process condition
   if [ "${#FILENAMES_TO_PROCESS[@]}" == "0" ]; then
      echo "no files require reprocessing"
      # set condition to exit while loop
      STOP=1
   # if files are found, re-process files on the list
   else
      # rm file that is being reprocessed
      # code to reprocess files that need it
      ...
   if

   # do statistics on re-processed files, this will create an updated filename for any re-processed file
   # filenames of re-processed files will be re-checked on next loop

done

As far as I can tell, this will re-process all files that need it. Re-processing will create a new set of file names. The code will loop back to check the new set of file names to see if anything still needs to be re-processed. The code will keep looping until no file names are found that need to be re-processed.

I still seem to be incapable of writing code without multiple nested loops.

Is there anything wrong with this that so far?

LMHmedchem
 

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LEARN ABOUT REDHAT

val

sccs-val(1)                                                        User Commands                                                       sccs-val(1)

NAME

       sccs-val, val - validate an SCCS file

SYNOPSIS

       /usr/ccs/bin/val -

       /usr/ccs/bin/val [-s] [-m name] [-rsid] [-y type] s.filename...

DESCRIPTION

       The val utility determines if the specified s.files meet the characteristics specified by the indicated arguments. val can process up to 50
       files on a single command line.

       val has a special argument, `-', which reads the standard input until the end-of-file condition is detected. Each  line  read  is  indepen-
       dently processed as if it were a command line argument list.

       val generates diagnostic messages on the standard output for each command line and file processed and also returns a single 8-bit code upon
       exit as described below.

       The 8-bit code returned by val is a disjunction of the possible errors, that is, it can be interpreted as a bit string where  (moving  from
       left to right) the bits set are interpreted as follows:

       bit 0 = missing file argument
       bit 1 = unknown or duplicate option
       bit 2 = corrupted s.file
       bit 3 = can not open file or file not in s.file format
       bit 4 = the SCCS delta ID (SID) is invalid or ambiguous
       bit 5 = the SID does not exist
       bit 6 = mismatch between %Y% and -y argument
       bit 7 = mismatch between %M% and -m argument

       val  can  process  two  or  more  files  on a given command line, and in turn can process multiple command lines (when reading the standard
       input). In these cases, an aggregate code is returned which is the logical OR of the codes generated for each command line  and  file  pro-
       cessed.

OPTIONS

       The following options are supported:

       -s       Silent.  Suppresses the normal error or warning messages.

       -m name  Compares name with the %M% ID keyword in the s.file.

       -rsid    Checks to see if the indicated SID is ambiguous, invalid, or absent from the s.file.

       -y type  Compares type with the %Y% ID keyword.

ENVIRONMENT VARIABLES

       See  environ(5)  for  descriptions of the following environment variables that affect the execution of val: LANG, LC_ALL, LC_CTYPE, LC_MES-
       SAGES, and NLSPATH.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWsprot                    |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Standard                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       sccs(1), sccs-admin(1), sccs-delta(1), sccs-get(1), sccs-help(1), what(1), sccsfile(4), attributes(5), environ(5), standards(5)

DIAGNOSTICS

       Use the SCCS help command for explanations (see sccs-help(1)).

SunOS 5.10                                                          30 Sep 2002                                                        sccs-val(1)
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