Of course.
When executed, the output (echo in line 9) is:
1
2
3
....until the length of the first line of the file "leerarchivo.sh"
but..the 'echo' in line 12 prints 0.
This is the result.
I would like the last '0' were 12! I don't understand why..
Dear All,
I am trying to write an script to calculate geometric centre of selected residues of a protein structure. Say I have a PDB file (a text containing the x, y, and z coordinates of atoms of a protein). I want to extract the X coordinates of the atoms belonging to the interested residues... (2 Replies)
I am trying to use two files and walk through the first one to see if a value from each record resides in the other file.
I am reading the file record by record and awking out the first field into a varaiable. That is working fine.
When I try to write my grep command it gives me an error.
... (7 Replies)
suppose i declare
a=b
b=30
echo $(echo $a)
i need to get the value as 30
i dont know if im right but it prints only 'b' as output.
How can i get the value referred by 'b' through the value of 'a' (4 Replies)
Hi,
I need a little help with variable use:
I have the a file with follow format:
Type: Test
Profile: 010
84240 27 15
84900 11 09
84993 55 44
84762 12 12
I need to look the value in the line containing "Profile" and put in front of the lines containing numbers... (6 Replies)
Hi Friends,
I have a problem when i run this piece of script, and do echo $? it always gives me value 0, even if the string "CCRCWebServerINSTALLDIR" is not present in that file. Why is that so, can you give me suggestion to the changes i need to make?
$find... (3 Replies)
Hi All,
I need to compare the string variable with input value which have more than one word which also should be case insensitive.
#!/bin/sh
echo "please choose your choice: "
read choice
if ` ]
then echo "correct"
else
echo "wrong"
fi
but i am getting the output for first word... (3 Replies)
hello there,
basically im screwed with a variable that should take the last modification date of a file.
my code is
fileCreationTime=$(( `ls -l $fileName | tr -s " " | cut -d " " -f6` ))
my problem arise coz when the code is executed and stored in a file the return value is 1993 and not... (4 Replies)
my script is some thing like this
i11="{1,2,3,4,5,6,7,8,9,10,11,}"
echo "enter value"
read value ..............suppose i11
x="$value"
echo "$($value)" .............the echo should be {1,2,3,4,5,6,7,8,9,10,11,}
but its showing "i11" only.
plz help me out to get desired... (10 Replies)
Discussion started by: sagar_1986
10 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)