Command to have a count of matching string
Hello,
I need a command-set or script in Perl which will take a String and File-name as inputs and displays the number of times the String is present in that file. Using 'grep' command with -c option will display the number of matching lines in which the String is present but not the count. Please let me know.
Thanks
I need a command-set or script in Perl which will take a String and File-name as inputs and displays the number of times the String is present in that file. Using 'grep' command with -c option will display the number of matching lines in which the String is present but not the count. Please let me know.
Thanks
is the number of matching lines in which the String is present different from the count because the string may occur more than once on a line?
If so, you might use something like
perl -lne 'BEGIN{$_=shift}END{print $.-1}' String File-name
(this assumes that the last String in the file is followed by a newline or some other character)
If so, you might use something like
perl -lne 'BEGIN{$_=shift}END{print $.-1}' String File-name
(this assumes that the last String in the file is followed by a newline or some other character)
ASKER
Hi Ozo, I'm not getting the correct value with your syntax. Could you please check ?
The output should be 10 in the below example.
[root@iss-chi-rad01 ashok]# cat testfile
A disk "snapshot" is a copy of the virtual machine disk file (VMDK) at a certain point in time. It preserves the disk file system and \n
system memory of your VM by enabling you to revert to the snapshot in case something goes wrong. Snapshot can be real lifesavers when \n
upgrading or patching applications and servers. This article will go over everything you need to know about using snapshot with VMware, \n
including what they are, how they work and advanced techniques. A virtual machine provides several operations for creating and managing \n
snapshots and snapshot chains. These operations let you create snapshots, revert to any snapshot in the chain, and remove snapshots. You \n
can create extensive snapshot trees.
[root@iss-chi-rad01 ashok]# perl -lne 'BEGIN{$_=shift}END{print $.-1}' snapshot testfile
5
[root@iss-chi-rad01 ashok]#
The output should be 10 in the below example.
[root@iss-chi-rad01 ashok]# cat testfile
A disk "snapshot" is a copy of the virtual machine disk file (VMDK) at a certain point in time. It preserves the disk file system and \n
system memory of your VM by enabling you to revert to the snapshot in case something goes wrong. Snapshot can be real lifesavers when \n
upgrading or patching applications and servers. This article will go over everything you need to know about using snapshot with VMware, \n
including what they are, how they work and advanced techniques. A virtual machine provides several operations for creating and managing \n
snapshots and snapshot chains. These operations let you create snapshots, revert to any snapshot in the chain, and remove snapshots. You \n
can create extensive snapshot trees.
[root@iss-chi-rad01 ashok]# perl -lne 'BEGIN{$_=shift}END{print $.-1}' snapshot testfile
5
[root@iss-chi-rad01 ashok]#
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Sorry I don't know how
perl -lne 'BEGIN{$/=shift}END{print $.-1}'
got changed to
perl -lne 'BEGIN{$_=shift}END{print $.-1}'
but that will only count the 9 "snapshot"s not the "Snapshot"
If you want case independent matching, you might try
perl -lne 'BEGIN{$r=qr/\Q@{[shift]}/
perl -lne 'BEGIN{$/=shift}END{print $.-1}'
got changed to
perl -lne 'BEGIN{$_=shift}END{print $.-1}'
but that will only count the 9 "snapshot"s not the "Snapshot"
If you want case independent matching, you might try
perl -lne 'BEGIN{$r=qr/\Q@{[shift]}/
ASKER
Thanks Tintin. That works perfectly.
Open in new window
This will cause that there will be only one 'your string' per line. Then "grep -c" will count these lines.