Add exception handling when file missing in shell script

Question

Inside shell script it is picking some files from UNIX directory. Sometimes when any of these file missed then throw error & shell script got failed. I need to add Exceptional Handling in shell script. Here is the below shell script where it is picking files from directory.

#!/bin/ksh
..........
while read file
do
    upd_date=$((`date +%s`-`stat -c %Y ${file}`))
    file_nm=`basename "${file}"`
    if [[ `lsof | grep "${file_nm}"` != '' || $upd_date -lt 60 ]];
    then
        log_info "Waiting for the file ${file} to complete transfer/skip"
    else
        log_info "Data file found ${file}"
    fi
done<${TEMP}/filepath
...............

exit 0

In the line upd_date=.. throwing error whenever file missed & shell script got failed. So I need to add exception handling if file missed then it will show in log & script will execute successfully.

Answer 1

Use continue in between while loop. continue will skip the current iteration in for, while and until loop.

#!/bin/ksh
..........
while read file
do
  [ -f "$file" ] || continue;
  upd_date=$((`date +%s`-`stat -c %Y ${file}`))
  file_nm=`basename "${file}"`
  if [[ `lsof | grep "${file_nm}"` != '' || $upd_date -lt 60 ]];
  then
    log_info "Waiting for the file ${file} to complete transfer/skip"
  else
    log_info "Data file found ${file}"
  fi
done<${TEMP}/filepath
...............

exit 0