question :how can i iterate to next item in for loop with the loop
e.g
for i in `cat abc.txt`
do
echo $i // this will display first line
i=$i+1; // this doesnt work for me.
echo $i; //this will display secound line
done
If we are working with lines, we do not want to expand the entire file "abc.txt" on the "for" line and then read it word by word.
We need to read each line one-by one with a method which preserves the record construct.
To make the extra read in the while loop:
Don't understand your second question. Not clear which file is which or what the process is.
Another question, is it possible to, in a for-loop incrementing until it reaches a certain number, to have it loop again without incrementing? Just have it drop what it is doing when it reaches this command and start again at the same number it was at? I know I could make a while loop and just... (0 Replies)
I wonder how to stop further loop iterations when conditions gets false e.g.
This file.txt contains the following structure :
1
2
3
4
5
6
7
8
9
10
How to stop iteration when if statement gets false ?
for n in `cat file.txt`
do
if (( n<=5 )) (1 Reply)
for VGLIST in `lsvg -o`
do
CLOSED_OUT=`echo $VGLIST | lsvg -l $VGLIST | awk '{print $6 " " $7}' | grep closed`
if ]; then
echo "Filesystems $CLOSED_OUT in VG that are in Closed status"
else
echo "\n Some message"
fi
Above Code is working fine, but echo "Filesystems $CLOSED_OUT... (8 Replies)
I have a script with logic like:
my_function()
{
if
mkdir $1
mkdir mydir_${2}
else
do something else
fi
}
read in list of items
while read list
do
my_function $list `date`
done
so basically it will make a directory for every name in the list and create a directory with the... (6 Replies)
bash in RHEL 6.4
I have a requirement in which I want to get the iteration count from a WHILE LOOP.
The below mentioned simple script test.sh works fine. In the below script, the WHILE loop will iterate every 5 seconds infinitely until it greps the string BASKETBALL from /tmp/somestring.txt... (6 Replies)
I am trying to check multiple server's "uptime" in a loop over "ssh".
When I execute multiple ssh commands with hard coded servernames script is executing fine.
But when I pass server names using while loop, script is exiting after checking first server's status, why?
# serverList... (8 Replies)
Hello,
I have been stuck on this for some time and invested many hours trying to find a solution. I am trying to either loop through two variables or or two arrays and not sure how to do it. I am limited to ksh only, and don't have the ability to do a foreach, or for i AND for j etc...I... (19 Replies)
Hello,
I've written a script to automate encoding of all the MP4 files in a directory (incl. subdirectories). But unfortunately it's running for the first MP4 file only.
My machine details:
root@Ubuntu16:~# uname -a
Linux Ubuntu16 4.10.0-28-generic #32~16.04.2-Ubuntu SMP Thu Jul 20 10:19:48... (2 Replies)
Discussion started by: prvnrk
2 Replies
LEARN ABOUT PHP
fgets
FGETS(3) 1 FGETS(3)fgets - Gets line from file pointerSYNOPSIS
string fgets (resource $handle, [int $length])
DESCRIPTION
Gets a line from file pointer.
PARAMETERS
o $handle
-The file pointer must be valid, and must point to a file successfully opened by fopen(3) or fsockopen(3) (and not yet closed by
fclose(3)).
o $length
- Reading ends when $length - 1 bytes have been read, or a newline (which is included in the return value), or an EOF (whichever
comes first). If no length is specified, it will keep reading from the stream until it reaches the end of the line.
Note
Until PHP 4.3.0, omitting it would assume 1024 as the line length. If the majority of the lines in the file are all larger
than 8KB, it is more resource efficient for your script to specify the maximum line length.
RETURN VALUES
Returns a string of up to $length - 1 bytes read from the file pointed to by $handle. If there is no more data to read in the file
pointer, then FALSE is returned.
If an error occurs, FALSE is returned.
CHANGELOG
+--------+-----------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+-----------------------------+
| 4.3.0 | |
| | |
| | fgets(3) is now binary safe |
| | |
+--------+-----------------------------+
EXAMPLES
Example #1
Reading a file line by line
<?php
$handle = @fopen("/tmp/inputfile.txt", "r");
if ($handle) {
while (($buffer = fgets($handle, 4096)) !== false) {
echo $buffer;
}
if (!feof($handle)) {
echo "Error: unexpected fgets() fail
";
}
fclose($handle);
}
?>
NOTES
Note
If PHP is not properly recognizing the line endings when reading files either on or created by a Macintosh computer, enabling the
auto_detect_line_endings run-time configuration option may help resolve the problem.
Note
People used to the 'C' semantics of fgets(3) should note the difference in how EOF is returned.
SEE ALSO fgetss(3), fread(3), fgetc(3), stream_get_line(3), fopen(3), popen(3), fsockopen(3), stream_set_timeout(3).
PHP Documentation Group FGETS(3)