Niether of them worked; the problem was it seemed to pick random points not the peaks (I plotted them using GMT).
Instead of accepting defeat can I trouble you for a little explanation, if I understood the logic a little better I think I could tweak it. I am still new at awk but my professor loves it, and the more I use it the more I realize how powerful it actually is.
This is the part I don't quite understand. What exactly does NR == 1 accomplish? Your setting the number of rows equal to one? does a ';' seperate commands? So you set last equal to column 2, lost_row equal to column one.
Why do your run a getline? I looked it up and it is defined as:
getline - returns 1 if it finds a record, and 0 if the end of the file is encountered
Anyways I get the feeling that $1 and $2 are now rows above and below not columns?
This part logically makes sense, and this is what I am trying to accomplish.
Hi,
If i want to write my data on several tapes, (more than one tape), what switch(s) i need to use with tar.
In other word if my data needs the sapce more than one tape & i don't wanna to compress or ... my data. so is it possible to write up to the end of the tape & it asks to put another... (1 Reply)
First, I just rebuilt/installed my custom kernel & I don't know how to check if it ran properly (I'm fairly sure it did, but I'm looking for reassurance that it loaded the new kernel file).
Second, I'd love to get into programming, scripting, whatever, I want my imagination to be the builder &... (2 Replies)
Hi,
I have a .txt file (uniqfields.txt) with 3 fields separated by " | " (pipe symbol). This file contains unique values with respect to all these 3 fields taken together. There are about 40,000 SORTED records (rows) in this file. Sample records are given below.
1TVAO|OVEPT|VO... (2 Replies)
Say I have a single bin directory with Linux and SunOS executables, like this:
bin/myprog_lnx
bin/myprog_sun
Assume these programs read from stdin and write to stdout and, thus, are meant to be run like this:
myprog_lnx < filein > fileout
My users may log in from a Linux or Solaris... (3 Replies)
Hey , I have become pretty normal, using unix and what not and working around FEDORA 9
I was wondering does anyone have any IDEAS or have anything I should try to build or scripts to write ,
or possibly know any sites where I could practice some things just so I know I am writing them... (2 Replies)
Hello All,
I am writing an shell script but abruptly its not able to recognize switches in echo statement.
#!/bin/bash
top -n 1 -b>ankit
host=`hostname`
time=`cat ankit|grep load|tr -s " "|cut -d " " -f3`
load=`cat ankit|grep load|tr -s " "|cut -d "," -f4|cut -d ":" -f2`
... (3 Replies)
Okay, so I'm not a complete newb when it comes to using Unix/Linux. I've been using Ubuntu for a few years now and I've dipped my toes into a few other distros but now I want to get a bit serious.
I'm looking at becoming a sysadmin but the trouble is...I have no idea where to start. What I'm... (1 Reply)
Hello
I need to split big xml file into multiple files based on xml declaration. for that i have written one awk 1 liner as below
awk '/<?xml\ version/{i++}{print > "outfile."i}' test123.xml
this is producing the desired out put. but i want the the currenttimestamp with milliseconds in the... (3 Replies)
Hi Guys,
I have this task to monitor a linux box. I found a program that displays the parameters that I want and I wrote a little .sh to run that program and record output into a file.
The findings look promising but I would like to graph them.
My output (for every iteration) looks like... (3 Replies)
Discussion started by: DraxDomax
3 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)