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Top Forums Shell Programming and Scripting Print in next line after coma Post 302935562 by Scrutinizer on Tuesday 17th of February 2015 12:24:31 PM
Old 02-17-2015
Quote:
Originally Posted by DGPickett
Some versions or 'tr' insist on char sets in and out in square brackets, probably a POSIX thing. You could 'tr' both ' ' and ',' to '\n' or 'tr' ',' to '\n' and then "tr -d ' '". The 'tr' is very fast, tolerant of long lines and large files, being entirely char by char.
Code:
tr -d '[ ]' < in_file | tr '[,]' '[\n]' > out_file

That was for ranges, not for enumerated strings of characters..

Quote:
On historical System V systems, a range expression requires enclosing square-brackets, such as:

tr '[a-z]' '[A-Z]'

However, BSD-based systems did not require the brackets, and this convention is used here to avoid breaking large numbers of BSD scripts:

tr a-z A-Z

The preceding System V script will continue to work because the brackets, treated as regular characters, are translated to themselves. However, any System V script that relied on "a-z" representing the three characters 'a', '-', and 'z' have to be rewritten as "az-".
tr: rationale

In fact, using brackets that way will also delete square brackets:
Code:
$  echo 'x[  ]x' | tr -d '[ ]'
xx


Last edited by Scrutinizer; 02-17-2015 at 03:22 PM..
 

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SHELL-QUOTE(1p) 					User Contributed Perl Documentation					   SHELL-QUOTE(1p)

NAME
shell-quote - quote arguments for safe use, unmodified in a shell command SYNOPSIS
shell-quote [switch]... arg... DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands or files with embedded white space or shell globbing characters safely. Here are a few examples. EXAMPLES
ssh preserving args When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and passes them to "$SHELL -c". This doesn't work as intended: ssh host touch 'hi there' # fails It creates 2 files, hi and there. Instead, do this: cmd=`shell-quote touch 'hi there'` ssh host "$cmd" This gives you just 1 file, hi there. process find output It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote: eval set -- `find -type f -print0 | xargs -0 shell-quote --` debug shell scripts shell-quote is better than echo for debugging shell scripts. debug() { [ -z "$debug" ] || shell-quote "debug:" "$@" } With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can. save a command for later shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are things the user can't pass through), you can do something like this: user_switches= while [ $# != 0 ] do case x$1 in x--pass-through) [ $# -gt 1 ] || die "need an argument for $1" user_switches="$user_switches "`shell-quote -- "$2"` shift;; # process other switches esac shift done # later eval "shell-quote some-command $user_switches my args" OPTIONS
--debug Turn debugging on. --help Show the usage message and die. --version Show the version number and exit. AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions. AUTHOR
Roderick Schertler <roderick@argon.org> perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)
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