Hello Guys,
I'm new to Shell scripting, and i need someone to help me with this issue:
I'm trying to do a dynamic update query on Sysbase database table using shell script.
Lets say, the Update query is "update Table set id=X" , where X is dynamic value for the loop index.
If the loop is... (10 Replies)
Hi All,
file_1.txt contains
aaa bbbb hhhh
vvvvv mmmmm iiiii
What i want is to search for the first coloumn of each line using awk.i.e as below:
awk '/aaa/ {printf(<>)}' file_1.txt
The print part (<>) should contain all the values(or coloumns ) in the particular line(here it... (8 Replies)
Hi All,
Shell is ksh
I've given portion of the script here to explain the problem.
It will accept 2 input parameters .
in_file1=$1
in_file2=$2
outbound_dir=/home/outbound
for i in 1 2
do
eval file$i=$outbound_dir/\$in_file$i
eval echo "filename is \$file$i"
... (4 Replies)
Hi,
I'm just trying to use a dynamic index for some array elements that I'm accessing within a loop. Specifically, I want to access an array at variable position $counter and then also at location $counter + 1 and $counter + 2 (the second and third array positions after it) but I keep getting... (0 Replies)
Let's say I want to print the arguments $4 till $#, how can I do this?
$# contains the number of arguments
$@ contain all the arguments as string
What i need is something like
for i in $4_till_$#; do
#do something with $i
convert $i ~/$output
done
The first 3 arguments are used as options... (6 Replies)
I have a task. The scenario is like this. I have a operation program (OPR1) , whose function is to simply double the (single)value it receives as input.
I have to write a script to operate the OPR1 and save its output in a file.
Later, I have to modify the script so as to be able to operate ... (0 Replies)
i=0
while
do
sizesfor0=`cat 16 | grep 'pickSize' -A 1 | grep '_sz' | cut -d'_' -f1`
sizesfor0=${sizesfor0//id=\"lll/:}
IFS=: array0=( $sizesfor0 )
echo ${array0}
i=$(( $i + 1 ))
done
So, right now I have two variables in the while statement above
sizesfor0 and array0
The... (1 Reply)
I am unable to loop print a python string array in my unix shell script:
~/readarr.sh '{{ myarr }}'
more readarr.sh
echo "Parameter 1:"$1
MYARRAY= $1
IFS=
MYARRAY=`python <<< "print ' '.join($MYARRAY)"`
for a in "$MYARRAY"; do
echo "Printing Array: $a"
done
Can you... (10 Replies)
Discussion started by: mohtashims
10 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)