I have two files and i want to perform different action based on the condition if both or either is empty
HTML Code:
If [ File 1 is not empty && File two is not empty ]
then
Do something
elif [ file 1 is empty && file 2 is not empty ]
then
do something
elif [ file 1 is not empty && file 2 is empty ]
then
do something
else
do something
fi
I have tried the below bt its not working. only the first condition is getting evaluated
Code:
if [[ -s "$f1" && -s "$f2" ]]
then
echo " Both not empty"
elif [[ ! -s "$f1" && -s "$f2" ]]
echo "First file empty and second not empty"
elif [[ -s "$f1" && ! -s "$f2" ]]
echo "Fist file not empty and second file empty"
else
echo " Both Files empty"
Hi,
May I know how to check for empty file in Perl.
Iam missing something, somewhere.
#!/usr/bin/perl
my $open_dir = '/path/';
my $file;
my $ma = "abc_.*.\.psv\$"
opendir(VAR, $open_dir) or die "Can't open $oepn_dir: $!\n";
while( defined ($file = readdir VAR) ) #read all... (1 Reply)
Hi Masters.....
I have problem !!!
I need to check number of records in a file and if it is zero or file is empty i need to do some task.
if ; then
echo "File s empty"
else
echo "Not empty"
fi
so how to check this condition.
I used wc -l < filename.txt => 1 for zero records
same result... (1 Reply)
Hi All,
I am new to unix worldd .
I need to check a file1 if its empty or not.
If its empty then return a non zero value say 99
could you pls let me know the perl script for this. (2 Replies)
How do I check if a file is empty in a sh script
I want to test in my shell script if the output file is empty and if it is do one thing and if it isnt empty do another?
any ideas? (8 Replies)
I am running a C shell script. I have an output file from a previous step and I need to run "something" in the next step to check if the file is empty. If the file is empty, then the job script should finish EOJ. If the file is not empty then the job script should abend.
Please help
Thanks. (4 Replies)
Hello,
I want to make a script which says if a text file is empty or not.
I tried two ways of making it, but I have problems with both of them.
Now I think that the better way is the ls -s solution (considering that an empty text file has a 0 weight, because "cat file.txt" fails when file is... (4 Replies)
CMD=$(find "${Release_Container}" -iname "${Release_Name}"_Release.txt)
for i in `cat $CMD`
do
if ];then
cd ${Sandbox_dir}
CMD1=$(find "${Sandbox_dir}"/* -iname "${Release_Name}" -type d | awk -F/ '{print $(NF)}' | head -1 )
if ];then
echo -e "################### CHECKOUT START... (2 Replies)
Hello again!
I have some trouble with scripting in bash.
In the following script I read from a folder with the files
line0_Ux.xy
line1_Ux.xy
line2_Ux.xy
.
.
.
Some of the files are empty. For those I would like to print a "0" in list.
I think the problem with the code is that... (4 Replies)
Hi,
I am using KSH.
I am trying to check if the output file is empty or not.
I tried with ] but what i see is my file is empty but still manages to have a size of 1 instead of 0.
But my file doesnot have anything its empty.
I am not sure how to check this.
can any one help? (10 Replies)
Hi All,
I need to check a file whether it exists and also whether it is empty or not. I have a code for this but it is not working as per my requirement. Can anyone pls suggest me on this.
function funcFLSanityCheck
{
if
then
echo "${varFLSentFileListPath}/${varFLSentFileName}... (7 Replies)
Discussion started by: Arun1992
7 Replies
LEARN ABOUT DEBIAN
file::queue
File::Queue(3pm) User Contributed Perl Documentation File::Queue(3pm)NAME
File::Queue - Persistent FIFO queue implemented in pure perl!
SYNOPSIS
use strict; # always!
use File::Queue;
my $q = new File::Queue (File => '/var/spool/yourprog/queue');
$q->enq('some flat text1');
$q->enq('some flat text2');
$q->enq('some flat text3');
# Get up to first 10 elements
my $contents = $q->peek(10);
my $elem1 = $q->deq();
my $elem2 = $q->deq();
# empty the queue
$q->reset();
DESCRIPTION
This module allows for the creation of persistent FIFO queue objects.
File::Queue only handles scalars as queue elements. If you want to work with references, serialize them first!
The module was written with speed in mind, and it is very fast, but it should be used with care. Please refer to the CAVEATS section.
Interface
File::Queue implements a OO interface. The object methods and parameters are described below.
Methods
File::Queue supports all of the queue-related functions a developer should expect.
o new()
Instantiates your File::Queue object. Parameters are described in the next sub-section.
o enq()
Enqueues a string element to the queue.
o deq()
Dequeues a string element from the queue, and returns the element. If the queue is empty, nothing is returned.
o peek(n)
Returns an arrayref containing the next n elements in the queue. If the queue size is less than n, all elements are returned. If the
queue is empty, an empty arrayref is returned.
o reset()
Emptys the queue.
o close()
Closes the filehandles belonging to the queue object ('.dat' and '.idx').
o delete()
Deletes the files belonging to the queue object ('.dat' and '.idx').
Parameters
There are a number of parameters that can be passed when constructing your File::Queue objects. Parameters are case-insensitive.
o File (required)
File::Queue creates two files using this parameter as the base. In the case of the example in the SYNOPSIS, the two files are
'/var/spool/yourprog/queue.dat' and '/var/spool/yourprog.idx'.
The '.dat' file holds all of the data, the '.idx' file holds the byte index (pointer) of the starting point of the first element in the
queue.
o Mode (optional)
The file bit mode to be shared by both the '.dat' and '.idx' files. Defaults to '0600'.
o Seperator (optional)
The character or byte sequence that is used to seperate queue elements in the '.dat' file. It should be something you can guarantee
will NEVER appear in your queue data. Defaults to the newline character.
o BlockSize (optional)
This is the size of the byte chunks that are pulled at each iteration when checking for the end of a queued element. Defaults to 64,
which will be fine for most cases, but can be tweaked or tuned for your specific case to squeeze out a few extra nanoseconds.
CAVEATS
This module should never be used in situations where the queue is not expected to become empty.
The '.dat' file is not truncated (emptied) until the queue is empty.
Even the data you've already dequeued remains in the '.dat' file until the queue is empty.
If you keep enqueueing elements and never FULLY dequeue everything, eventually your disk will fill up!
SEE ALSO
Tie::File
AUTHOR
Jason Lavold <jlavold [ at ] gmail.com>
perl v5.10.0 2008-12-22 File::Queue(3pm)