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When I use "cat test.file", it will show
1 2 3 4 When I use the Bash file,
cat test.file | while read data do echo "$data" done It will show
1 2 3 4 How could I make the result just like the original test file?
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Syntax: Read file line by line on a Bash Unix & Linux shell file. The -r option passed to read command prevents backslash escapes from being interpreted. Add IFS= option before read command to prevent leading/trailing whitespace from being trimmed. while IFS= read -r line; do COMMAND_on $line; done < input.
Bash uses whitespace to determine where words begin and end. The first word is the command name and additional words become arguments to that command.
IFS='' cat test.file | while read data do echo "$data" done I realize you might have simplified the example from something that really needed a pipeline, but before someone else says it:
IFS='' while read data; do echo "$data" done < test.file Actually, if you don't supply an argument to the "read" call, read will set a default variable called $REPLY which will preserve whitespace. So you can just do this:
$ cat test.file | while read; do echo "$REPLY"; done If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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