I have a very (or so I thought) simple script I want to execute. The output should be 1 line of text from a web page called by lynx.
Code:
#!/bin/bash
cat urlList.txt
while read line; do
#echo $line
output="$(lynx -dump -accept_all_cookies $line | sed -n '2p')"
echo "$output"
done
I am self taught and do not write all that often anymore. The output works in the command line, by that I mean, I get the 1 line of text I desire by typing the command in manually in the command line.
I guess I need some assistance in working on understanding command substitution. I could write this all out to a bunch of temp files, but that seems like a waste of code as well as a waste of cpu time.
Hi ,
I am having one situation in which I need to run some simple unix commands after doing "chroot" command in a shell script. Which in turn creates a new shell.
So scenario is that
- I need to have one shell script which is ran as a part of crontab
- in this shell script I need to do a... (2 Replies)
my friend has quized me.. I'm very new to scripts but I know I'm somewhat close
any help would be a major help..
here is the script
ex
shell program, hello, to display the phrase "hello world" 50 times (script should verify the
count) . Do not use a for loop! (hint should show... (5 Replies)
Hi
I tried with bash --login option. but the output is
siva:~$ bash --login
siva:~$
is there any way to make the shell ask for user id and password ( and login as different user instead of using sudo / su )
Thx in advance
Siva (3 Replies)
i have a small problem getting a batxh shell script to run in shell
this is the code
the problem seems to be centered around the ffmpeg command, something maybe to do with the ' ' wrapping around the vhook part command
this is a strange problem , if i take the ffmpeg command and... (1 Reply)
Hi,
I am using HP-UNIX.
I have a requirement as below
I have to change env twice like:
cadenv <env>
cadenv <env>
ccm start -d /dbpath
ccm tar -xvf *.tar
ccm rcv ....
mv *.tar BACKUP
but after I do the first cadenv <env> , I am unable to execute any of the later commands .
... (6 Replies)
Hello gurus,
I have three korn shell script 3.1, 3.2, 3.3. I would like to call three shell script in one shell script.
i m looking for something like this
call 3.1;
If 3.1 = "complete" then
call 3.2;
if 3.2 = ''COMPlete" then
call 3.3;
else
exit
The... (1 Reply)
basically i'm tired of hitting the left arrow a few dozen times when correcting a mistake or modifying a history command
i'd like to use vim style key shortcuts while on the command line so that a 55 moves the cursor 55 places to the left...
and i want all the other vi goodies, search of... (3 Replies)
Guys,
when i am executing the following script I am getting following error.
-bash: test.sh: command not found
$ test.sh -- script name
#! /bin/bash
echo " Job started........"
CURRENTDIR=`pwd`
exit 0
thanks
Please view this link: How to use ... tags (2 Replies)
Dear Friends,
Please help me on this
my script name is send.csh
In this i have written the statement like this
set args = ( city state country price )
I want to pass this array to another c shell called receiver.csh. and i want to use it in this c shell
or
how to pass to... (2 Replies)
Discussion started by: SA_Palani
2 Replies
LEARN ABOUT PHP
system
SYSTEM(3) 1 SYSTEM(3)system - Execute an external program and display the outputSYNOPSIS
string system (string $command, [int &$return_var])
DESCRIPTION system(3) is just like the C version of the function in that it executes the given $command and outputs the result.
The system(3) call also tries to automatically flush the web server's output buffer after each line of output if PHP is running as a
server module.
If you need to execute a command and have all the data from the command passed directly back without any interference, use the passthru(3)
function.
PARAMETERS
o $command
- The command that will be executed.
o $return_var
- If the $return_var argument is present, then the return status of the executed command will be written to this variable.
RETURN VALUES
Returns the last line of the command output on success, and FALSE on failure.
EXAMPLES
Example #1
system(3) example
<?php
echo '<pre>';
// Outputs all the result of shellcommand "ls", and returns
// the last output line into $last_line. Stores the return value
// of the shell command in $retval.
$last_line = system('ls', $retval);
// Printing additional info
echo '
</pre>
<hr />Last line of the output: ' . $last_line . '
<hr />Return value: ' . $retval;
?>
NOTES
Warning
When allowing user-supplied data to be passed to this function, use escapeshellarg(3) or escapeshellcmd(3) to ensure that users can-
not trick the system into executing arbitrary commands.
Note
If a program is started with this function, in order for it to continue running in the background, the output of the program must be
redirected to a file or another output stream. Failing to do so will cause PHP to hang until the execution of the program ends.
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 exec(3), passthru(3), popen(3), escapeshellcmd(3), pcntl_exec(3), backtick operator.
PHP Documentation Group SYSTEM(3)