Is there a way to count the no. of fields (columns) in a file?
Actually I need to cut some fields starting from the middle to the end. How can I specify to cut till last field?
thanks in advance
:) (4 Replies)
hi
i am a new unix user
i want to check whether a file contains spacefied no of fields
if so i should delete last fields
and then insert some fields in 2nd field
please help me
Thanks Regards
babu :mad: (7 Replies)
I need help to find out the number of lines in a file which exists in remote machine.
I the remote machine, auto login is enabled. So I do not need to worry about the username or password. But the problem is, I do not know how I can find out the line count once I get the FTP prompt. (1 Reply)
I have a line of more than 3000 bytes which will contain & as fields separator..I am using following awk command ..Its working but its not accepting the line more than 3000 bytes...Anyother alternate solution even in othe shell command also fine...
awk -F '&' '{for( i=1; i<=NF; i++ ) print $i}'... (2 Replies)
I have a file a.xml
some portion of the file is given below.But the file format is same.
CTYPE available_templates SYSTEM './available_templates.dtd'>
<available_templates>
<template_file name="Approve External" path="core/approve/bin"
<command_list>
<command... (1 Reply)
Hi,
I have created one shell script in which it will count number of "~" tilda charactors from each line of the file.But the problem is that i need to count each line count individually, that means. if line one contains 14 "~"s and line two contains 15 "~"s then it should give an error msg.each... (3 Replies)
Hello All,
I got a requirement when I was working with a file. Say the file has unloads of data from a table in the form
1|121|asda|434|thesi|2012|05|24|
1|343|unit|09|best|2012|11|5|
I was put into a scenario where I need the field count in all the lines in that file. It was simply... (6 Replies)
Hello All,
I am trying a one liner for finding the number of null columns in every line of my flat file.
The format of my flat file is like this
a|b|c|d||||e|f|g|
a|b|c|d||||e|f|g|
I want to count the number of fields delimited by "|" which are blank.
In above case the count should be... (6 Replies)
Hello,
I have been working on Awk/sed one liner which counts the number of occurrences of '|' in pipe separated lines of file and delete the line from files if count exceeds "17".
i.e need to get records having exact 17 pipe separated fields(no more or less)
currently i have below :
awk... (1 Reply)
Hi,
I have a file with a list of bunch of IP addresses from different VLAN's . I am trying to find the list the number of each vlan occurence in the output
Here is how my file looks like
1.1.1.1
1.1.1.2
1.1.1.3
1.1.2.1
1.1.2.2
1.1.3.1
1.1.3.2
1.1.3.3
1.1.3.4
So what I am trying... (2 Replies)
Discussion started by: new2prog
2 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)