Bakunin's explanation is correct and little to add for the cases covered. But the orig. request had a construct like A && B || C. In this case, C is the "fallback" branch in case A should fail:
And this is what happens in the request: Variable B collects all packages to be installed and D all packages to be updated.
Hi there,
I found a trick to easily postpone a command by a few seconds:
supernova:~# sleep 10 && command &If you logout, the command should still be executed... But not all the time.
Could anyone of you explain me why the following command is executed even after logging out:
supernova:~# sleep... (2 Replies)
Hi friends,
I have a script that sets the env variable path based on different conditions.
Now the new path variable setting should not done in the same terminal or same shell.
Only a new terminal or new shell should have the new path env variable set.
I am able to do this only as follows:
>cd... (1 Reply)
Hi, I hope the title does not scare people to look into this thread but it describes roughly what I'm trying to do. I need a solution in PHP.
I'm a programming beginner, so it might be that the approach to solve this, might be easier to solve with an other approach of someone else, so if you... (0 Replies)
Hello All
I have a xml file with many sets of records
like this
<mytag>mydata</mytag>
<tag2>data&</tag2>
also same file can be like this
<mytag>mydata</mytag>
<tag2>data&</tag2>
<tag3>data2&data3</tag3>
Now i can grep & and replace with & for whole file but it will replace all... (4 Replies)
Hi, I have text file abc.txt. In this file, I have the following data.
Input:
Mr Smith & Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith & Mrs Smith
Mr Smith& Mrs Smith
Mr Smith &Mrs Smith
Output:
Mr Smith & Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith & Mrs Smith
Mr Smith&... (4 Replies)
What am I doing wrong here? Or is this not possible?
A bug?
alias f='find . >found 2>/dev/null &'
f ; sleep 20 ; ls -l
-bash: syntax error near unexpected token `;' (2 Replies)
Hi!
I wanted to simplify my bash prompt, so I edited my etc/bashrc file. I thought this was the file that would override any other env files. When I opened it, I saw that the way it was setup was not what my prompt looked like, although I forget exactly what was there. But i edited it the way I... (1 Reply)
This script runs tshark, then displays the output. I want to read a keypress at all times throughout this script, especially during the 10 seconds that tshark is running. This code however, only takes input before tshark runs.
#!/bin/bash
main() {
while (( "1" == "1" )) ; do
keypress &&... (3 Replies)
Hi All,
I am trying to run a script which will search for 2 strings(stopped,started) in a text file and echo an output depending on below condition
-bash-3.2$ cat trial1.txt
v
ggg
f
-bash-3.2$ cat trial1.sh
VAR9=` grep 'stopped' /tmp/trial1.txt`
VAR10=` grep 'started'... (4 Replies)
Hi All,
Do you have any sample script,
- auto get file from SFTP remote server and delete file in remove server after downloaded.
- only download specify filename
- auto upload file from local to SFTP remote server and delete local folder file after uploaded
- only upload specify filename
... (3 Replies)
Discussion started by: weesiong
3 Replies
LEARN ABOUT PHP
is_string
IS_STRING(3) 1 IS_STRING(3)is_string - Find whether the type of a variable is stringSYNOPSIS
bool is_string (mixed $var)
DESCRIPTION
Finds whether the type given variable is string.
PARAMETERS
o $var
- The variable being evaluated.
RETURN VALUES
Returns TRUE if $var is of type string, FALSE otherwise.
EXAMPLES
Example #1
is_string(3) example
<?php
$values = array(false, true, null, 'abc', '23', 23, '23.5', 23.5, '', ' ', '0', 0);
foreach ($values as $value) {
echo "is_string(";
var_export($value);
echo ") = ";
echo var_dump(is_string($value));
}
?>
The above example will output:
is_string(false) = bool(false)
is_string(true) = bool(false)
is_string(NULL) = bool(false)
is_string('abc') = bool(true)
is_string('23') = bool(true)
is_string(23) = bool(false)
is_string('23.5') = bool(true)
is_string(23.5) = bool(false)
is_string('') = bool(true)
is_string(' ') = bool(true)
is_string('0') = bool(true)
is_string(0) = bool(false)
SEE ALSO is_float(3), is_int(3), is_bool(3), is_object(3), is_array(3).
PHP Documentation Group IS_STRING(3)