10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have been trying to use read in a script with issues so I tried some things on the command line.
$ echo "testing 123" | read x ; echo $xand
$ echo "testing 123" | read -r x ; echo $xare only producing any output after being invoked the first time after rebooting the machine. I also got into... (14 Replies)
Discussion started by: Michael Stora
14 Replies
2. UNIX for Advanced & Expert Users
Can anyone explain why wc is behaving weirdly? Their are only 2 occurrences but wc thinks their are 7 occurrences. I have even manually checked this.
$ grep -i base *
lit: base xx
lit.lst:003- 00103 BASE XX
$ grep -i base * | wc -w ... (2 Replies)
Discussion started by: cokedude
2 Replies
3. Shell Programming and Scripting
Hi,
Immediate help on below will be appreciated.
I have to read a file (max of 10MB) which will have no new line characters, i.e. data in single line. and have to inster '\n' at every 100 characters. and if record starts with 'BUCA' then need to pick value of length 10 at position 71 and... (7 Replies)
Discussion started by: maks475
7 Replies
4. Programming
Hello.
During the holidays I've been developing an application on my desktop computer at home.
I setup a repository on github, so when I got back to work I cloned the repo to my laptop.
It wouldn't work.
The app is comprised of a client and a server, strangely enough the server would segfault... (10 Replies)
Discussion started by: erupter
10 Replies
5. Red Hat
I have two servers on same domain. one can nslookup other cannot
Psu100 can lookup to psu000, psu010 & psu011
Psu110 can NOT lookup to psu000, psu010 & psu011
I verified resolv.conf entries on both psu000 and psu010 and it contains both name servers (10.200.10.21 & 10.200.11.22).I am... (1 Reply)
Discussion started by: scorohan
1 Replies
6. UNIX and Linux Applications
I have been using firefox3.5 now for some months and noticed that some images, notably in the png format, do not display correctly: the images are not displayed at all or display in part whereby the rest of the image shows a black rectangle. Does anybody else suffer from this problem?
Desktop:... (0 Replies)
Discussion started by: figaro
0 Replies
7. UNIX for Advanced & Expert Users
Hi Gurus,
I tried FTP one file to UNIX which got values like
wel^come
If I see the content in unix, it shows like
wel^Zcome
^ coverted into ^Z (Control + Z )
Can someone please share what is happening here?
Thanks,
Shahnaz (5 Replies)
Discussion started by: shahnazurs
5 Replies
8. Shell Programming and Scripting
Im trying to execute the below command on our server to list files and replace the newline in the file list with spaces, but the character 'n' is getting replaced with a space, is there any environment variable that needs to be set in UNIX?
sh -c 'ls -trx... (1 Reply)
Discussion started by: rameshrr3
1 Replies
9. UNIX for Advanced & Expert Users
I have a large file with the first 2 characters of each line determining the type of record. type 03 being a subheader and then it will have multiple 04 records.
eg: 03,xxx,xxxx,xxxx
04,xxxxxxxxxxxxxxxxxxxxxxxxxxxx
04,xxxxxxxxxxxxxxxxxxxxxxxxxxxx
03,xxx,xxx,xxx
... (2 Replies)
Discussion started by: badg3r
2 Replies
10. Programming
i have made a ftp application in socket programming which uses TCP/IP .. i have the problem runing the only problem is on the client side i take the user input for the file to be downloaded from the command promt.
write(s, argv, strlen(argv)+1); // this is how i write in client side
argv is... (1 Reply)
Discussion started by: toughguy2handle
1 Replies
POPEN(3) 1 POPEN(3)
popen - Opens process file pointer
SYNOPSIS
resource popen (string $command, string $mode)
DESCRIPTION
Opens a pipe to a process executed by forking the command given by $command.
PARAMETERS
o $command
- The command
o $mode
- The mode
RETURN VALUES
Returns a file pointer identical to that returned by fopen(3), except that it is unidirectional (may only be used for reading or writing)
and must be closed with pclose(3). This pointer may be used with fgets(3), fgetss(3), and fwrite(3). When the mode is 'r', the returned
file pointer equals to the STDOUT of the command, when the mode is 'w', the returned file pointer equals to the STDIN of the command.
If an error occurs, returns FALSE.
EXAMPLES
Example #1
popen(3) example
<?php
$handle = popen("/bin/ls", "r");
?>
If the command to be executed could not be found, a valid resource is returned. This may seem odd, but makes sense; it allows you to
access any error message returned by the shell:
Example #2
popen(3) example
<?php
error_reporting(E_ALL);
/* Add redirection so we can get stderr. */
$handle = popen('/path/to/executable 2>&1', 'r');
echo "'$handle'; " . gettype($handle) . "
";
$read = fread($handle, 2096);
echo $read;
pclose($handle);
?>
NOTES
Note
If you're looking for bi-directional support (two-way), use proc_open(3).
Note
When safe mode is enabled, you can only execute files within the safe_mode_exec_dir. For practical reasons, it is currently not
allowed to have .. components in the path to the executable.
Warning
With safe mode enabled, the command string is escaped with escapeshellcmd(3). Thus, echo y | echo x becomes echo y | echo x.
SEE ALSO
pclose(3), fopen(3), proc_open(3).
PHP Documentation Group POPEN(3)