12-16-2008
global variable not holding its value?
dear there,
this kept me awake last night, the variable ${TO} in the following script doesn't seem to hold its value.
I have a file ./filelist, which lists all files of interests. I group them by keywords in the filename, and would like to count total number of lines in each group.
---------------------------------------
#!/bin/bash -xv
TO=1
for i in key1 key2;do
TO=0
grep $i ./filelist |\
while read FILE;do
let TO=$((${TO}+`cat $FILE|wc -l`))
echo "total number of lines in file whose name containing $i increased to ${TO}"
done
echo "total number of lines in file whose name containing $i finally
equal to ${TO}"
done
------------------------------------
the content of ./filelist:
key1_week1.csv
key2_week2.csv
key1_week3.csv
key2_week4.csv
--------------------------------
note: the number of lines in each file listed above is 3, 2, 5, 9
--------------------------------
the output is wierd since the final total is wrong while the running total are right:
number of lines in file whose name containing key1 increased to 3
number of lines in file whose name containing key1 increased to 8
total number of lines in file whose name containing key1 is 0
number of lines in file whose name containing key2 increased to 2
number of lines in file whose name containing key2 increased to 11
total number of lines in file whose name containing key2 is 0
So why ${TO} holds its value after the while loop? isn't it a global variable? This puzzled me!
Thanks for your patience!
Sincerely Yours,
Michael
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DBIPROF(1) User Contributed Perl Documentation DBIPROF(1)
NAME
dbiprof - command-line client for DBI::ProfileData
SYNOPSIS
See a report of the ten queries with the longest total runtime in the profile dump file prof1.out:
dbiprof prof1.out
See the top 10 most frequently run queries in the profile file dbi.prof (the default):
dbiprof --sort count
See the same report with 15 entries:
dbiprof --sort count --number 15
DESCRIPTION
This tool is a command-line client for the DBI::ProfileData. It allows you to analyze the profile data file produced by DBI::ProfileDumper
and produce various useful reports.
OPTIONS
This program accepts the following options:
--number N
Produce this many items in the report. Defaults to 10. If set to "all" then all results are shown.
--sort field
Sort results by the given field. Sorting by multiple fields isn't currently supported (patches welcome). The available sort fields
are:
total
Sorts by total time run time across all runs. This is the default sort.
longest
Sorts by the longest single run.
count
Sorts by total number of runs.
first
Sorts by the time taken in the first run.
shortest
Sorts by the shortest single run.
key1
Sorts by the value of the first element in the Path, which should be numeric. You can also sort by "key2" and "key3".
--reverse
Reverses the selected sort. For example, to see a report of the shortest overall time:
dbiprof --sort total --reverse
--match keyN=value
Consider only items where the specified key matches the given value. Keys are numbered from 1. For example, let's say you used a
DBI::Profile Path of:
[ DBIprofile_Statement, DBIprofile_Methodname ]
And called dbiprof as in:
dbiprof --match key2=execute
Your report would only show execute queries, leaving out prepares, fetches, etc.
If the value given starts and ends with slashes ("/") then it will be treated as a regular expression. For example, to only include
SELECT queries where key1 is the statement:
dbiprof --match key1=/^SELECT/
By default the match expression is matched case-insensitively, but this can be changed with the --case-sensitive option.
--exclude keyN=value
Remove items for where the specified key matches the given value. For example, to exclude all prepare entries where key2 is the method
name:
dbiprof --exclude key2=prepare
Like "--match", If the value given starts and ends with slashes ("/") then it will be treated as a regular expression. For example, to
exclude UPDATE queries where key1 is the statement:
dbiprof --match key1=/^UPDATE/
By default the exclude expression is matched case-insensitively, but this can be changed with the --case-sensitive option.
--case-sensitive
Using this option causes --match and --exclude to work case-sensitively. Defaults to off.
--delete
Sets the "DeleteFiles" option to DBI::ProfileData which causes the files to be deleted after reading. See DBI::ProfileData for more
details.
--dumpnodes
Print the list of nodes in the form of a perl data structure. Use the "-sort" option if you want the list sorted.
--version
Print the dbiprof version number and exit.
AUTHOR
Sam Tregar <sam@tregar.com>
COPYRIGHT AND LICENSE
Copyright (C) 2002 Sam Tregar
This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5 itself.
SEE ALSO
DBI::ProfileDumper, DBI::Profile, DBI.
perl v5.16.2 2013-08-25 DBIPROF(1)