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Shell Programming and Scripting
Unix Dummy!
Post 302288389 by freixo on Tuesday 17th of February 2009 05:44:19 AM
02-17-2009
Unix Dummy!
Hi everyone!! i need some help to do the next exercice, if some one can help-me!
Perform a script to swap two lines of a file. The name of
file as the two line numbers are passed as a parameter. It should be
verify that the file exists, have the necessary permits and lines.
i try everthing, but i can do it!!
Perform a script to swap two lines of a file. The name of
file as the two line numbers are passed as a parameter. It should be
verify that the file exists, have the necessary permits and lines.
i try everthing, but i can do it!!
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LEARN ABOUT OPENDARWIN
nl
NL(1) User Commands NL(1) NAME
nl - number lines of files SYNOPSIS
nl [OPTION]... [FILE]... DESCRIPTION
Write each FILE to standard output, with line numbers added. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --body-numbering=STYLE use STYLE for numbering body lines -d, --section-delimiter=CC use CC for logical page delimiters -f, --footer-numbering=STYLE use STYLE for numbering footer lines -h, --header-numbering=STYLE use STYLE for numbering header lines -i, --line-increment=NUMBER line number increment at each line -l, --join-blank-lines=NUMBER group of NUMBER empty lines counted as one -n, --number-format=FORMAT insert line numbers according to FORMAT -p, --no-renumber do not reset line numbers for each section -s, --number-separator=STRING add STRING after (possible) line number -v, --starting-line-number=NUMBER first line number for each section -w, --number-width=NUMBER use NUMBER columns for line numbers --help display this help and exit --version output version information and exit By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn. CC are two delimiter characters used to construct logical page delimiters, a missing second character implies :. Type \ for . STYLE is one of: a number all lines t number only nonempty lines n number no lines pBRE number only lines that contain a match for the basic regular expression, BRE FORMAT is one of: ln left justified, no leading zeros rn right justified, no leading zeros rz right justified, leading zeros AUTHOR
Written by Scott Bartram and David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report nl 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
Full documentation at: <http://www.gnu.org/software/coreutils/nl> or available locally via: info '(coreutils) nl invocation' GNU coreutils 8.28 January 2018 NL(1)