Hey ,
I'm trying to perform the following command, however it cannot read the variable assigned earlier. I'm not sure why this happen. Please help thanks
while :
do
echo "what's ur name? (if none just press )"
read name
changeName = echo $name | sed "s/on/ey/"
echo $changeName #this... (8 Replies)
I am making of a script that will go through a couple of for loops and create file names based on the values in that loop, however the variable that combines everything is not getting assigned properly:
#! /bin/bash
for imod in K33_j1b_WS9_6
do
for emod in mb2A mb2C mb3A mb3C mb4A... (1 Reply)
Hi,
i'm posting this in the Solaris forum although maybe it should be better in the General unix forum, I'm formatting an output witht he following command:
crontab -l | grep GBOUAT8 | grep UTP | grep -i stop | sed 's/\\//'
08 2 * * 2-6 /apps/sum_glob/gbo_uat/sparse/bin/dmg_cronlaunch -ENVI... (2 Replies)
The requirement is, there is a log file which contains a huge data. i need to get a particular field out of it by searching with another field.
ex:
2011-03-28 13:00:07,423 : millis=231 q={ call get_data_account(?,?,?,?,?) }, params=
i need to search for the word "get_data_account" in file... (1 Reply)
I am trying to check whether a variable has been assigned on the command line or not.
Here is what I did:
#!/usr/bin/bash
if( $variable == '\0')
{
print "variable was not assigned"
exit
}
else
NF = 2 {print $1, ""}
exit
fi
awk -f question1.awk variable = 58 letters.txt.
So... (3 Replies)
I am more of a newbie, but wanted to post this in this forum as I was afraid no one would look at it in unix forums as it concerns shell scripting. I have a shell script that now runs fine with the exclusion of one line:
x=`su nbadmin -c "ssh -t servery /usr/openv/netbackup/bin/bplist -C... (7 Replies)
I want to do 2 things in single line that is evaluating a command to get return code and store $2 of awk if the command exit code is 0.
eval "ade desc ${filename}@@/<branch_name> | grep Version | awk '{print $2}' 2>&1 1>/dev/null"
ret=$?
echo "$ret $val"
if
then
... (3 Replies)
Experts,
I'm having problems with the code below.
I'm trying to test $var2 for two different regexs.
I thought it could be done per below, but I'm getting the following error when running.
$ ./test.pl b fed50c0100****
Unescaped left brace in regex is deprecated, passed through in regex; marked... (2 Replies)
Discussion started by: timj123
2 Replies
LEARN ABOUT PHP
empty
EMPTY(3) 1 EMPTY(3)empty - Determine whether a variable is emptySYNOPSIS
bool empty (mixed $var)
DESCRIPTION
Determine whether a variable is considered to be empty. A variable is considered empty if it does not exist or if its value equals FALSE.
empty(3) does not generate a warning if the variable does not exist.
PARAMETERS
o $var
- Variable to be checked
Note
Prior to PHP 5.5, empty(3) only supports variables; anything else will result in a parse error. In other words, the follow-
ing will not work: empty(trim($name)). Instead, use trim($name) == false.
No warning is generated if the variable does not exist. That means empty(3) is essentially the concise equivalent to !isset($var)
|| $var == false.
RETURN VALUES
Returns FALSE if $var exists and has a non-empty, non-zero value. Otherwise returns TRUE.
The following things are considered to be empty:
o "" (an empty string)
o 0 (0 as an integer)
o 0.0 (0 as a float)
o "0" (0 as a string)
o NULL
o FALSE
o array() (an empty array)
o $var; (a variable declared, but without a value)
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.5.0 | |
| | |
| | empty(3) now supports expressions, rather than |
| | only variables. |
| | |
| 5.4.0 | |
| | |
| | Checking non-numeric offsets of strings returns |
| | TRUE. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
A simple empty(3) / isset(3) comparison.
<?php
$var = 0;
// Evaluates to true because $var is empty
if (empty($var)) {
echo '$var is either 0, empty, or not set at all';
}
// Evaluates as true because $var is set
if (isset($var)) {
echo '$var is set even though it is empty';
}
?>
Example #2
empty(3) on String Offsets
PHP 5.4 changes how empty(3) behaves when passed string offsets.
<?php
$expected_array_got_string = 'somestring';
var_dump(empty($expected_array_got_string['some_key']));
var_dump(empty($expected_array_got_string[0]));
var_dump(empty($expected_array_got_string['0']));
var_dump(empty($expected_array_got_string[0.5]));
var_dump(empty($expected_array_got_string['0.5']));
var_dump(empty($expected_array_got_string['0 Mostel']));
?>
Output of the above example in PHP 5.3:
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
Output of the above example in PHP 5.4:
bool(true)
bool(false)
bool(false)
bool(false)
bool(true)
bool(true)
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Note
When using empty(3) on inaccessible object properties, the __isset() overloading method will be called, if declared.
SEE ALSO isset(3), __isset(), unset(3), array_key_exists(3), count(3), strlen(3), The type comparison tables.
PHP Documentation Group EMPTY(3)