Not sure I understand. You want to eliminate non-printable chars from a string?
in pseudo code :
MY_VAR should set to null if it contains one or more not printable character
Somethings like
my current filter is ---------- Post updated at 13:09 ---------- Previous update was at 12:54 ----------
Hello
would appreciate if somebody can post a bash script that checks if the first character of the given string is equal to, say, "a"
thnx in advance (2 Replies)
i have a file contains like this:
i want to create a script that will insert a comma "." after the 10th character so it would be look like this
thanks in advance (5 Replies)
I'm working with a large file with multiple records, each record begins with ISA. The issue is, sometimes ISA is at the start of the line, sometimes it's in the middle of the line. So before I can csplit my main file into multiple records, I have to get each record header onto its own line.
... (7 Replies)
cp $l_options $srcdirfile $destdirfile
If i want to check whether there is a non printable character in the variables
$l_options $srcdirfile $destdirfile
how it can be done? (2 Replies)
Hi!
If I want to extract a character from a specific position of a string, I can use ${string:1:1} (if I want character at the position 1). How can I do the same thing, when the number of position is contained in the variable? ${string:$var:1}doesn't work, unfortunately.
Thanks in advance. (2 Replies)
In bash, how can one remove the last character of a string? In perl, the chop function would remove the last character. However, I do not know how to do the same job in bash.
Many thanks in advance. (12 Replies)
Hello.
I am using :
sed -i -e '/§name_script§/a#'"${MY_TAB11}"'# \
#'"${MY_TAB1}"'The Standard way'"${MY_TAB7}"'# \
#'"${MY_TAB1}"'==============='"${MY_TAB7}"'# \ ' "$CUR_FILE"
Is there a better way to define "MY_TAB7","MY_TAB11" in other way than :
MY_TAB1=$'\t'
MY_TAB2=${MY_TAB1}$'\t'... (2 Replies)
I am writing a bash script that will find all references to the “Well_List” in the “Comp_File”.
I am filtering a Well_List that contains the following:
TEST_WELL_01
TEST_WELL_02
TEST_WELL_11
TEST_WELL_22
GOV_WELL_1
GOV_WELL_201
PUB_WELL_57
PUB_WELL_82
.
.
Comparison... (5 Replies)
For some testing I want to insert a non printable character in a file. How to do it? I inserted ctrl-v ctrl-k through vi. But I do not think it is a proper non printable character. (3 Replies)
Hi,
I am new in bash scripting. In my work, I provide support to several users and when I connect to their computers I use the same admin and password, so I am trying to create a script that will only ask me for the IP address and then connect to the computer without having me to type the user... (5 Replies)
Discussion started by: arcoa05
5 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)