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Top Forums Shell Programming and Scripting problem executing awk in shell "not found" Post 302469928 by script_op2a on Monday 8th of November 2010 04:43:07 PM
Old 11-08-2010
Quote:
Originally Posted by scottn
The difference between
Code:
awk '{print $0;}' $infile

and
Code:
awk '{print $0;}' < $infile

is whether to open a file for reading ($input) or reading from an existing file (standard input).

Unless you're keen to know the name of the file you're reading for, there's no real difference in this case.

As for "POSIX", when asked what OS you are using, it's neither here nor there.
I was told that it's POSIX, similar to the Korn shell. That you could use:

#!/usr/bin/sh
or
#!/usr/bin/ksh


in the shell scripts but they seem to work differenly so I'm sticking to /sh


 

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TRUNCATE(1)                                                        User Commands                                                       TRUNCATE(1)

NAME
truncate - shrink or extend the size of a file to the specified size SYNOPSIS
truncate OPTION... FILE... DESCRIPTION
Shrink or extend the size of each FILE to the specified size A FILE argument that does not exist is created. If a FILE is larger than the specified size, the extra data is lost. If a FILE is shorter, it is extended and the extended part (hole) reads as zero bytes. Mandatory arguments to long options are mandatory for short options too. -c, --no-create do not create any files -o, --io-blocks treat SIZE as number of IO blocks instead of bytes -r, --reference=RFILE base size on RFILE -s, --size=SIZE set or adjust the file size by SIZE bytes --help display this help and exit --version output version information and exit The SIZE argument is an integer and optional unit (example: 10K is 10*1024). Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (pow- ers of 1000). SIZE may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round down to multiple of, '%' round up to multiple of. AUTHOR
Written by Padraig Brady. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report truncate 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
dd(1), truncate(2), ftruncate(2) Full documentation at: <http://www.gnu.org/software/coreutils/truncate> or available locally via: info '(coreutils) truncate invocation' GNU coreutils 8.28 January 2018 TRUNCATE(1)
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