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Top Forums Shell Programming and Scripting how to cut first 3 characters of each line in a file Post 302189170 by drewrockshard on Friday 25th of April 2008 07:01:23 AM
Old 04-25-2008
Another way, you could do the following:

Code:
#!/bin/sh
cat sample1.txt | while read FILE
do
        SUBSTRING=${FILE:0:3}
        echo $SUBSTRING
done

Regards,
Drew
 

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CAT(1)								   User Commands							    CAT(1)

NAME
cat - concatenate files and print on the standard output SYNOPSIS
cat [OPTION]... [FILE]... DESCRIPTION
Concatenate FILE(s) to standard output. With no FILE, or when FILE is -, read standard input. -A, --show-all equivalent to -vET -b, --number-nonblank number nonempty output lines, overrides -n -e equivalent to -vE -E, --show-ends display $ at end of each line -n, --number number all output lines -s, --squeeze-blank suppress repeated empty output lines -t equivalent to -vT -T, --show-tabs display TAB characters as ^I -u (ignored) -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB --help display this help and exit --version output version information and exit EXAMPLES
cat f - g Output f's contents, then standard input, then g's contents. cat Copy standard input to standard output. AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report cat translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
tac(1) Full documentation at: <http://www.gnu.org/software/coreutils/cat> or available locally via: info '(coreutils) cat invocation' GNU coreutils 8.28 January 2018 CAT(1)
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