Simple loops

Here is a small collection of loops you can perform in the bash shell.
Use CompileOnline (ideone works as well)to run the code.
Paste the following sample data into the input.txt file on CompileOnline and run the loops.

Used resources:
SyntaxHighlighter
CompileOnline ABSG


Aang
Korra
Wang
Eska
Tonraq
Kya
Desna
Senna
Bumi
Raava
Unalaq
Varrik
Vaatu

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Filename=input.txt echo "# for loop redirection with \"<\"" count=0 name= for k in $(wc -l $Filename | cut -d' ' -f1 | xargs seq) do read name echo "=> $name" let "count += 1" if [ "${name//$'\r'/$''}" == "Bumi" ]; then break fi done < "$Filename" echo "Lines: $count" echo "# while loop redirection with pipe" count=0 name= cat "$Filename" | while read name do echo "=> $name" ((i++)) if [ "${name//$'\r'/$''}" == "Bumi" ]; then break fi done echo "Lines: $count" echo "# while loop redirection with subshell" count=0 name= while read name do echo "=> $name" let "count += 1" if [ "${name//$'\r'/$''}" == "Bumi" ]; then break fi done < <(cat "$Filename") echo "Lines: $count" echo "# while loop redirection with \"<\"" count=0 name= while [ "${name//$'\r'/$''}" != "Bumi" ] do read name echo "=> $name" let "count += 1" done < "$Filename" echo "Lines: $count" echo "# until loop redirection with \"<\"" count=0 name= until [ "${name//$'\r'/$''}" == "Bumi" ] do read name echo "=> $name" let "count += 1" done < "$Filename" echo "Lines: $count" echo "# while loop redirection with exec" count=0 name= exec 3<&0 exec 0<"$Filename" while [ "${name//$'\r'/$''}" != "Bumi" ] do read name echo "=> $name" let "count += 1" done exec 0<&3 exec 3<&- echo "Lines: $count"