Shell Programming and Scripting

Hi arun888
If you do not mind to learn some more
You do not need to use the command cat there; the command tail can do the same by itself

Code:

tail -4 input.txt

By the way, there should be only four (4) lines in your output, instead of five (5).

Hi don,

Please find my exact requirement and answers for your questions.

Instead of showing us examples of lines from your input file, please describe in English the format of the filenames in that file:
User will be provided the file names in the input.txt file and the file name with "ADUS" need to be check whether it is exist in /retail/market/salil directory and the file name with "PROM" need to be checked whether it is present in /retail/market/loki directory.

Code:

tail -6 input.txt
INFOPRC.W1078.V018.ADUS
INFOPRC.W1078.V019.ADUS
INFOPRC.W1078.V118.ADJUS
INFOPRC.PJOMGPJ.HTC40004.W1078.PROM
INFOPRC.POMGPJ.HTS40001.W1078.PROM
INFOPRC.PJMGPJ.HTS40002.W1078.PROM

How many (period separated) fields can there be in your filenames?

5 field separtor in PROM file and 4 field separator in ADUS file.
Is the 2nd field (the string between the 1st and 2nd periods in the filename) always the week number?
In PROD and ADUS file it differs.
Is the last field always the field that contains ADUS or PROM (or none of the above)?
yes last file contains ADUS or PROM.
Can any field other than the last field be empty (i.e., in addition to HTS40007.W1978.
Last field might be empty sometimes.
could there be a filename like HTS40006.W1978..PROM )?
no i have wrongly provided.

Assuming you still want to look for the file in a subdirectory of the directories you named for the ADUS files and the PROM files corresponding to the week number named in the file you're processing, perhaps something like:

Code:

#!/bin/ksh
#set -xv	# Uncomment this line to enable tracing.
ADUSf=adus.txt
ADUSp=/retail/market/salil
INPUTf="${1:-input.txt}"
NONEf=none.txt
PROMf=prom.txt
PROMp=/retail/market/loki
rm -f "$ADUSf" "$NONEf" "$PROMf"
OIFS="$IFS"
IFS=.
while read -r file
do	set -- $file
	if [ $# -eq 4 ] && [ "$4" = "ADUS" ]
	then	week="$2"
		path="$ADUSp/$week/$file"
		printf '%s\n' "$file" >> "$ADUSf"
	elif [ $# -eq 5 ] && [ "$5" = "PROM" ]
	then	week="$4"
		path="$PROMp/$week/$file"
		printf '%s\n' "$file" >> "$PROMf"
	else	printf '%s\n' "$file" >> "$NONEf"
		continue
	fi
	if [ -s "$path" ]
	then	printf '%s is available\n' "$file"
	else	printf '%s is not available\n' "$file"
	fi
done < "$INPUTf"
IFS="$OIFS"

would work. Note that if there isn't any other code you want to add to the end of this script, there is no need to save the old value of $IFS before setting it to . and no need to reset it to its prior value after the while loop completes.

Hi Dan,

Thanks for your help