Hi,
I am trying to redefine the value of a variable based on another variable value. And I want to read in my variables from a enviroment file in the end -- at least I think so. But 1st here's what I want I need to get working:
var_1="11 10 9 8 7 6 5 4 3 2 1"
var_2=3
var_3=4
So I want... (12 Replies)
Can anyone tell me what is the purpose of a substitute variable in the unix programming language and give an example where it may be used?
Thanks! (0 Replies)
hi,
trying to learn more abt sed :(
i want to substitute a variable(a) with other variable(b) appended.
Read.txt contains:
home/test2/abc
home/test/root1
input.txt contains:
make test "home/test1/none"version="1.3"
wt's wrong test "home/test2/abc"version="1.0"
make save... (9 Replies)
hi all,
how do i assign values passed in from command line to and sql statement in perl ?? e.g
i want to assign :name1 and :Name2 to be whatever is passed into the perl script command line
my $sqlStr = "select * from test_table where column1 = upper(nvl(:name1, name1 )) and column2... (1 Reply)
I have a large csv file that looks like this:
The 3rd field is a unix time stamp that I want to convert to human readable.
I wrote a bash script with this code:
IFS=$','
cat $1 | while read ID user DATE text flags read; do
echo -e "$ID,$user,$(date -d @$DATE),$text,$flags,$read... (3 Replies)
dear,
I have below file called folderlist.txt
# ParentFolder environment_flag SubFolders
triss 1 checksum
bookstructure 1
fx 1 checksum_GMDB
I have a script which which will create the folders under... (3 Replies)
Hi ,
I have input file like below
Hi this is "vinoth".
Hi happy to work with 'unix'
USA(united states of America)
My script variables are below :
Dquote=Ộ
Squote=&#$567
Obrac=&^986
Cbrac=&^745
I want to read the variables in my SED command to replace the double quote,single... (9 Replies)
hi ,
please help me in this context
pkg1_name="/dir1/dir2/dir3/pkg1.txt"
pkg2_name="/dir1/dir2/dir4/pkg2.txt"
.
.
.
input to the script is pkg1 or pkg2 or ...
i have used pkg variable to save input i.e.
pkg=$1
now i need the following
result=`awk something ${pkg}_name ` for... (2 Replies)
Hi,
I need to set "prd" in the below command to a unix variable
nawk '/^#/ {next} FNR==NR {prd;next} !($0 in prd)'
So, this is what i did
fname=prd // unix shell variable
nawk -v fname=$fname '/^#/ {next} FNR==NR {fname;next} !($0 in fname)'But the value of fname i.e "prd" is not... (8 Replies)
Dear All,
I would like to instantiate a "pattern file" substituting "variable name" by their content.
Saying, we have:
1/ a "pattern file" containing different "variable name", the first character of the "variable name" is "@":
$ cat TPTModl.txt
DEFINE... (12 Replies)
Discussion started by: dae
12 Replies
LEARN ABOUT PHP
eval
EVAL(3) 1 EVAL(3)eval - Evaluate a string as PHP codeSYNOPSIS
mixed eval (string $code)
DESCRIPTION
Evaluates the given $code as PHP.
Caution
The eval(3) language construct is very dangerous because it allows execution of arbitrary PHP code. Its use thus is discouraged.
If you have carefully verified that there is no other option than to use this construct, pay special attention not to pass any user
provided data into it without properly validating it beforehand.
PARAMETERS
o $code
- Valid PHP code to be evaluated. The code mustn't be wrapped in opening and closing PHP tags, i.e. 'echo "Hi!";' must be passed
instead of '<? echo "Hi!"; >'. It is still possible to leave and reenter PHP mode though using the appropriate PHP tags, e.g.
'echo "In PHP mode!"; ?>In HTML mode!<? echo "Back in PHP mode!";'. Apart from that the passed code must be valid PHP. This
includes that all statements must be properly terminated using a semicolon. 'echo "Hi!"' for example will cause a parse error,
whereas 'echo "Hi!";' will work. A return statement will immediately terminate the evaluation of the code. The code will be exe-
cuted in the scope of the code calling eval(3). Thus any variables defined or changed in the eval(3) call will remain visible
after it terminates.
RETURN VALUES eval(3) returns NULL unless return is called in the evaluated code, in which case the value passed to return is returned. If there is a
parse error in the evaluated code, eval(3) returns FALSE and execution of the following code continues normally. It is not possible to
catch a parse error in eval(3) using set_error_handler(3).
EXAMPLES
Example #1
eval(3) example - simple text merge
<?php
$string = 'cup';
$name = 'coffee';
$str = 'This is a $string with my $name in it.';
echo $str. "
";
eval("$str = "$str";");
echo $str. "
";
?>
The above example will output:
This is a $string with my $name in it.
This is a cup with my coffee in it.
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Tip
As with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of
this function, and save it in a string (for example).
Note
In case of a fatal error in the evaluated code, the whole script exits.
SEE ALSO call_user_func(3).
PHP Documentation Group EVAL(3)