how can i only display the result according to user input?
For example:
i have a data file(in the attachement), when the user enter "1" it will only display whole records with pid from the data file matches to the users entered.
Try the below code.
echo "Enter the PID :"
read pid
linenum=`cat tes.txt | tr -s " " "|" | cut -d"|" -f2 |grep -n $pid`
cat tes.txt | head -$linenum | tail -1
Its giving the expected results.
==========
Thanks,
Karthikeyan.
hi Karthikeyan_113! i have error when i run the code.
error shown:
head: unrecongonized option `-:'
Does it have to be awk/ksh? Can you use perl?
awk 'BEGIN{
printf "%s : " ,"What Pid"
getline pid <"-"
}
$1==pid' "file"
you could just post your Perl solution. If OP wants a Perl solution, he will use it.
Edit: Do not try this code, it's got a couple of errors. See below for corrected version.
You're right mate. I am not sure what he wants printed out, the whole line or just part of the data, but this prints the whole line associated with the PID number:
use strict;
use warnings;
print "Enter the PID :"
my $pid = <STDIN>;
chomp $pid;
open (IN , "tes.txt");
while (<IN>) {
print if (/^\s*$pid\s/);
last;
}
close IN;
exit;
my result, after putting a semicolon at prompt for entering PID
# more tes.txt
PID PPID USER CMD %CPU START STAT
1 0 root /sbin/init 0.0 02:25 Ss
2 0 root [kthreadd]
# more test.pl
#!/usr/bin/perl
use strict;
use warnings;
print "Enter the PID :";
my $pid = <STDIN>;
chomp $pid;
open (IN , "tes.txt");
while (<IN>) {
print if (/^\s*$pid\s/);
last;
}
close IN;
exit;
# ./test.pl
Enter the PID :1
#
# perl -v
This is perl, v5.8.8 built for i586-linux-thread-multi
sorry that i ddint specify clearly... is there any way of either using awk or grep to retrive only the result from the user input?
eg. the user enter "1" and it matches from the data file pid column. It will display only the whole line of the matches.
Thanks ghostdog74, I owe you one. Corrected code:
use strict;
use warnings;
print "Enter the PID :";
my $pid = <STDIN>;
chomp $pid;
open (IN , "tes.txt") or die "$!";
while (<IN>) {
if (/^\s*$pid\s/) {
print;
last;
}
}
close IN;
exit;
have you even tried the awk script ? ( or the Perl one?)
yup!!! i try use awk when i enter "1" or "2" it will display the whole data. Is there any way that i can limit my search to only the entered digit and display only the row
echo "enter pid"
read code
grep "$code" | awk '{print $0}'
When executing the script for a wrong PID, the error " -: ".
When the varaible linenum is having a null value, we get the above error.
To overcome this, we need put a exception. I have corrected the code.
Please check this.
echo "Enter the PID :"
read pid
linenum=`cat tes.txt | tr -s " " "|" | cut -d"|" -f2 |grep -n $pid`
if [[ $linenum != '' ]]
then
cat tes.txt | head -$linenum | tail -1
else
echo "Incorrect option... Please try again."
fi
If you get any errors, please send the input file & execution steps.
For your reference, u have attached the my exeution steps.
==========
Thanks,
Karthikeyan.
Karthikeyan_113, below is wat i get the error when i run the script "head: 2:6563: invalid number of lines"
ubuntu@ubuntu:$ bash test.sh
PID PPID USER CMD %CPU START STAT
6563 6560 ubuntu -bash 0.0 Jan28 S+
6567 6564 ubuntu -bash 0.0 Jan28 S+
6574 6570 ubuntu -bash 0.0 Jan28 S+
6578 6575 ubuntu -bash 0.0 Jan28 S+
6599 6579 ubuntu -bash 0.0 Jan28 S+
6605 6580 ubuntu -bash 0.0 Jan28 S+
7920 7695 ubuntu x-session-manager 0.0 Jan28 Ssl
7987 7920 ubuntu /usr/bin/ssh-agent x-sessio 0.0 Jan28 Ss
7994 1 ubuntu /usr/lib/libgconf2-4/gconfd 0.0 Jan28 S
7997 1 ubuntu /usr/bin/gnome-keyring-daem 0.0 Jan28 S
7999 1 ubuntu dbus-daemon --fork --print- 0.0 Jan28 Ss
8001 1 ubuntu /usr/lib/gnome-control-cent 0.0 Jan28 Sl
8007 7920 ubuntu /usr/bin/metacity --replace 0.0 Jan28 S
8009 7920 ubuntu gnome-panel --sm-client-id 0.0 Jan28 S
8012 7920 ubuntu nautilus --no-default-windo 0.0 Jan28 S
8016 1 ubuntu /usr/lib/gamin/gam_server 0.0 Jan28 S
8019 1 ubuntu /usr/lib/bonobo-activation/ 0.0 Jan28 Ssl
8020 1 ubuntu gnome-volume-manager --sm-c 0.0 Jan28 Ss
8023 1 ubuntu /usr/lib/gnome-vfs-2.0/gnom 0.0 Jan28 S
8046 7920 ubuntu vino-session --sm-client-id 0.0 Jan28 S
8047 7920 ubuntu bluetooth-applet 0.0 Jan28 S
8051 7920 ubuntu update-notifier 0.0 Jan28 S
8056 1 ubuntu /usr/lib/nautilus-cd-burner 0.0 Jan28 S
8057 7920 ubuntu /usr/lib/evolution/2.12/evo 0.0 Jan28 Sl
8061 7920 ubuntu python /usr/share/system-co 0.0 Jan28 S
8063 7920 ubuntu nm-applet --sm-disable 0.0 Jan28 S
8072 1 ubuntu gnome-power-manager 0.0 Jan28 Ss
8088 1 ubuntu gnome-screensaver 0.0 Jan28 Ss
8090 1 ubuntu /usr/lib/gnome-applets/tras 0.0 Jan28 S
8104 1 ubuntu /usr/lib/gnome-applets/mixe 0.0 Jan28 Sl
8108 1 ubuntu /usr/lib/fast-user-switch-a 0.0 Jan28 S
8110 1 ubuntu /usr/bin/python /usr/lib/de 0.0 Jan28 S
9708 1 ubuntu /usr/lib/notification-daemo 0.0 Jan28 S
20905 1 ubuntu gedit file:///home/ubuntu/D 0.1 Jan28 S
24892 1 ubuntu gnome-terminal 0.0 01:44 Sl
24895 24892 ubuntu gnome-pty-helper 0.0 01:44 S
24896 24892 ubuntu bash 0.0 01:44 Ss
24937 24896 ubuntu bash myPs.sh 0.0 01:48 T
26658 24896 ubuntu bash myPs.sh 0.0 09:59 S+
26659 26658 ubuntu bash myPs.sh 0.0 09:59 S+
26660 26659 ubuntu ps U ubuntu -o pid,ppid,use 0.0 09:59 R+
Enter the PID :
6563
head: 2:6563: invalid number of lines
ubuntu@ubuntu:$