eval is useful when cmd contains something which needs to be evaluated by the shell. The typical case would be when you have a variable containing the index of an argument you want to access.
Hi, experts.
Whould anybody clear explay me difference and usage of these 3 commands (particulary in bash) :
exec
eval
source
I've tryed to read the manual pages but did not get much.
Also could not get something useful from Google search - just so much and so not exactly, that is... (3 Replies)
In POSIX shell, we don't have arrays, but we can iterate over a list like this:
#!/bin/sh
list="Fred Barney Wilma Betty"
for i in $list; do echo $i; done
Fred
Barney
Wilma
Betty
But let's say we want "Mr. Slate" in the list.
We know we can't just stick him in there like this:... (5 Replies)
Hi
How to call a shell scripting through a Perl scripting? Actually I need some value from Shell scripting and passes in the Perl scripting. So how can i do this? (2 Replies)
I am stuck on something that should really be simple, and was looking for some help..
I am new to shell scripting.Need help on this.....
The script is to find the stale nfs.
cat file
- - - - /abcd/1234
I am writing the script to check the nfs errors of above file
... (3 Replies)
According to the POSIX specifications eval is a special shell built-in, which should imply that variable assignments specified together with it should remain in effect after the built-in completes. Thus one would expect IFS to be changed after this:
var=$'a\nb c'
$ IFS=$'\n' eval '
for i in... (4 Replies)
Gents,
I have been working in a Solaris/Unix environment for about 9 months. I took some linux classses online before getting the job. But, I am not very good at scripting. I want to learn how to script. Do you think that I should start with Shell scripting or Perl? I wanted to continue with... (2 Replies)
Hi all,
some small script with eval turned me to crazy.
my OS is linux
Linux s10-1310 2.6.16.53-0.8.PTF.434477.3.TDC.0-smp #1 SMP Fri Aug 31 06:07:27 PDT 2007 x86_64 x86_64 x86_64 GNU/Linux
below script works well
#!/bin/bash
eval ssh remotehost date
eval ssh remotehost ls
below... (1 Reply)
anyone has any info on why this is complaining???
vivek@vivek-c5e55ef2e ~/TAC
$ zoneCounter=1
vivek@vivek-c5e55ef2e ~/TAC
$ optUsage1=23%
vivek@vivek-c5e55ef2e ~/TAC
$ eval eval echo "<th>Zone $zoneCounter </th><th align=\"left\"> \$optUsage$zoneCounter </th>"
-bash: syntax error... (13 Replies)
Discussion started by: vivek d r
13 Replies
LEARN ABOUT PHP
http_build_url
HTTP_BUILD_URL(3) 1 HTTP_BUILD_URL(3)http_build_url - Build a URLSYNOPSIS
string http_build_url ([mixed $url], [mixed $parts], [int $flags = HTTP_URL_REPLACE], [array &$new_url])
DESCRIPTION
Build a URL.
The parts of the second URL will be merged into the first according to the flags argument.
PARAMETERS
o $url
- (part(s) of) a URL in form of a string or associative array like parse_url(3) returns
o $parts
- same as the first argument
o $flags
- a bitmask of binary or'ed HTTP_URL constants; HTTP_URL_REPLACE is the default
o $new_url
- if set, it will be filled with the parts of the composed url like parse_url(3) would return
RETURN VALUES
Returns the new URL as string on success or FALSE on failure.
EXAMPLES
Example #1
A http_build_url(3) example
<?php
echo http_build_url("http://user@www.example.com/pub/index.php?a=b#files",
array(
"scheme" => "ftp",
"host" => "ftp.example.com",
"path" => "files/current/",
"query" => "a=c"
),
HTTP_URL_STRIP_AUTH | HTTP_URL_JOIN_PATH | HTTP_URL_JOIN_QUERY | HTTP_URL_STRIP_FRAGMENT
);
?>
The above example will output:
ftp://ftp.example.com/pub/files/current/?a=c
SEE ALSO parse_url(3), http_build_str(3).
PHP Documentation Group HTTP_BUILD_URL(3)