Hi guyz,
suppose there is a variable a=sachin.
I want to have letter 'c' from variable a.
I am trying this awk 'substr(sachin,2,1)'
but its not working.
I cant user cut as it requires a file whereas i have a variable. (4 Replies)
I'm new to shell scripting, and need to add a series of commands to the ends of certain lines of text that contain a keyword. Any easy way to do this? Thanks (2 Replies)
hello
i have a file (myfile) contains line as follows
/home/mytarget/myproject
i want to add a pattern at the end of this line.
my pattern is- /.*mk
i want like it - /home/mytarget/myproject/*.mk
i tried sed like
sed 's/$//*.mk/' myfile > newfilename, but not wrking.
pls... (2 Replies)
Dear friends,
I am facing a problem with a flat file, to solve that file i need to add certain character in the file which I am not able to do because of "$" sign in the pattern.
Situation is as follows.
Flat file has word RMM$CART
I want to reple this word by RMM$CART DFD
The dollar "$"... (5 Replies)
I need to add a word from file1 to file2 accordinggly... file1 contains name of servers and file2 version of server
I need that information in a single file so that the format is
server_name : version
I been trying but havent been able to figure out how to search for a file using sed...
... (14 Replies)
Hello,
I have a list:
i.e:
40331786
50331787
30331788
30331789
30331790
50331791
50331792
50331793
70331794
70331795
70331796
...
...
and I need to add text before and after each number: (2 Replies)
I have a file input.txt which have loads of weird characters, html tags and useful materials. I want to display 35 characters after the word description excluding weird characters like $$#$#@$#@***$# and without html tags in the new file output.txt. Help me. Thanx in advance.
My final goal is to... (11 Replies)
I have a file input.txt which have loads of weird characters, html tags and useful materials. I want to display 35 characters after the word "description" excluding weird characters like $&lmp and without html tags in the new file output.txt. Help me. Thanx in advance. I have attached the input... (4 Replies)
Hi,
var=QSB SBD SDN SGJ SJP SKB SKD SLP SML SNB SRE SRG STP TAJ UMP UNO VKS VND VNS WAH ZRR
I have to put *.sql after every word
What I did
echo $var>/root/file1.sql
sed -i 's/ /*.sql /g' file1.sql
cat file1.sql
Output
QSB*.sql SBD*.sql SDN*.sql SGJ*.sql SJP*.sql SKB*.sql... (9 Replies)
Discussion started by: kaushik02018
9 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)