07-31-2007
Extracting Data from a File
Hi
I need to calculate the number of occurrences of a item in a number of files using Perl.
The item appears continually throughout the files but in each case I only want to calculate it in certain blocks of the file.
Example - Calculalte the number of occurrences of a 'pass' in a block of code which starts with 'Start' and end with 'Finish'.
It is not possible to say start at line 1 and count the number of occurrences of the item until you reach line 5 as the files are all different sizes and the block is located at different places in all the files.
I'm sure this is possible but I just can't seem to get my head around this Perl scripting
Any help would be great
OOP
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QUOT(8) BSD System Manager's Manual QUOT(8)
NAME
quot -- display disk space occupied by each user
SYNOPSIS
quot [-acfhknv] [filesystem ...]
DESCRIPTION
The quot utility is used to gather statistics about the disk usage for each local user.
The following options are available:
-a Include statistics for all mounted file systems.
-c Display three columns containing number of blocks per file, number of files in this category, and aggregate total of blocks in files
with this or lower size.
-f For each user, display count of files and space occupied.
-h Estimate the number of blocks in each file based on its size. Despite that this does not give the correct results (it does not
account for the holes in files), this option is not any faster and thus is discouraged.
-k Force the numbers to be reported in kilobyte counts. By default, all sizes are reported in 512-byte block counts.
-n Given a list of inodes (plus some optional data on each line) in the standard input, for each file print out the owner (plus the
remainder of the input line). This is traditionally used in the pipe:
ls -i | sed -e 's,^ *,,' | sort -k 1n | quot -n filesystem
to get a report of files and their owners.
-v In addition to the default output, display the number of files not accessed within 30, 60 and 90 days.
ENVIRONMENT
BLOCKSIZE If the environment variable BLOCKSIZE is set, and the -k option is not specified, the block counts will be displayed in units of
that size block.
SEE ALSO
df(1), quota(1), getmntinfo(3), fstab(5), mount(8)
HISTORY
This implementation of quot is by Wolfgang Solfrank / TooLs GmbH.
BUGS
ncheck (which would be a lot more useful than ls -i in the example above) does not exist in FreeBSD.
BSD
February 8, 1994 BSD