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typo, missing IFS= and -r, moved the redirection to a command group so case be not run if the file can't be opened.

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edited Jun 13, 2022 at 6:15

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Read a line, using "read", then use "case" to decide what to do.

read{
 First lineIFS= <read File.txt-r Firstline
  case "$Firstline" in
     ("HDR"*"1234"*) mv File.txt Pattern1.txt
                echo "File with pattern1 received..." ;;
     ("HDR"*"5678"*) mv File.txt Pattern2.txt
                echo "File with pattern2 received..." ;;
     (*)        echo "Nothing matched" ;;
  esac
} < File.txt

Read a line, using "read", then use "case" to decide what to do.

read First line < File.txt
case "$Firstline" in
   ("HDR"*"1234"*) mv File.txt Pattern1.txt
              echo "File with pattern1 received..." ;;
   ("HDR"*"5678"*) mv File.txt Pattern2.txt
              echo "File with pattern2 received..." ;;
   (*)        echo "Nothing matched" ;;
esac

Read a line, using "read", then use "case" to decide what to do.

{
  IFS= read -r Firstline
  case "$Firstline" in
     ("HDR"*"1234"*) mv File.txt Pattern1.txt
                echo "File with pattern1 received..." ;;
     ("HDR"*"5678"*) mv File.txt Pattern2.txt
                echo "File with pattern2 received..." ;;
     (*)        echo "Nothing matched" ;;
  esac
} < File.txt

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answered Jun 13, 2022 at 5:16

icarus

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1
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57

Read a line, using "read", then use "case" to decide what to do.

read First line < File.txt
case "$Firstline" in
   ("HDR"*"1234"*) mv File.txt Pattern1.txt
              echo "File with pattern1 received..." ;;
   ("HDR"*"5678"*) mv File.txt Pattern2.txt
              echo "File with pattern2 received..." ;;
   (*)        echo "Nothing matched" ;;
esac