Hello,
We have a requirement to disable running shell commands via vi using "!".
Can anybody please suggest how to disable this option.
The requirement arises because we open up a xterm window with a config file in vi mode for the customer to edit. After the customer edits the config... (1 Reply)
Hello all!
I have two consoles.I know the PID of these two.Now I want to execute a command in console#1 but from console#2. How can I achieve this?
Anyone can do something for my query?
Click here if you can't understand my query or to know the need for this query. (3 Replies)
Hello
I need to run some sed commands but it involves "/" in the substitute or delete, any ideas how I get round the problem.
Example:
cat file1.txt | sed -e '/</Header>/d' > file2.txt
This errors due to the forward slash before the Header text.
Thanks (3 Replies)
Hi,
I am cutting data from a fixed length test file and then writing out a new record using the echo command, the problem I have is how to stop multiple spaces from being written to the output file as a single space.
Example:
cat filea | while read line
do
field1=`echo $line | cut -c1-2`
... (6 Replies)
I need an if code in shell script where it should continue to further commands after succesfully installing the executable file.
i.e. /run installer is continuing but in the middle it executes further commands like "cp /root/user which were given after /run installer.
I want /runinstaller... (16 Replies)
Hello,
well what I'm trying to do is to remove underscores from filenames and leaving empty spaces instead:
arturas@Universe:/windows/Center/training$ ls
big_file failas su shudu
arturas@Universe:/windows/Center/training$ a=big_file
arturas@Universe:/windows/Center/training$ mv $a `echo... (8 Replies)
Hey im new in this...anything will be helpful...
The user will input the word or phrase .... I want to search the user input in file (by lines) but not all then with this line search on another file ( with the specific line) and show to the user.
Example:
file1.txt
=======
a
aa
aaa... (2 Replies)
Hi I want to run two commands in background, i am using below way, but it is not working, i m calling these two commands from one script to another server where below commands are running, in my script ssh is working fine, but command is not going in background, please advise what should i do.
... (10 Replies)
version info : Fedora 28 (Kernel version: 4.16.12-300)
shell : bash
Using echo command , if I redirect a text like "Chocolate" to a file , all the contents in the file are overwritten as shown below.
# cat /tmp/someTest
Hello world
One more Hello world
myLine3
# echo... (4 Replies)
Discussion started by: kraljic
4 Replies
LEARN ABOUT PHP
echo
ECHO(3) 1 ECHO(3)echo - Output one or more stringsSYNOPSIS
void echo (string $arg1, [string $...])
DESCRIPTION
Outputs all parameters.
echo is not actually a function (it is a language construct), so you are not required to use parentheses with it. echo (unlike some other
language constructs) does not behave like a function, so it cannot always be used in the context of a function. Additionally, if you want
to pass more than one parameter to echo, the parameters must not be enclosed within parentheses.
echo also has a shortcut syntax, where you can immediately follow the opening tag with an equals sign. Prior to PHP 5.4.0, this short syn-
tax only works with the short_open_tag configuration setting enabled.
I have <?=$foo?> foo.
PARAMETERS
o $arg1
- The parameter to output.
o $...
-
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
echo examples
<?php
echo "Hello World";
echo "This spans
multiple lines. The newlines will be
output as well";
echo "This spans
multiple lines. The newlines will be
output as well.";
echo "Escaping characters is done "Like this".";
// You can use variables inside of an echo statement
$foo = "foobar";
$bar = "barbaz";
echo "foo is $foo"; // foo is foobar
// You can also use arrays
$baz = array("value" => "foo");
echo "this is {$baz['value']} !"; // this is foo !
// Using single quotes will print the variable name, not the value
echo 'foo is $foo'; // foo is $foo
// If you are not using any other characters, you can just echo variables
echo $foo; // foobar
echo $foo,$bar; // foobarbarbaz
// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10);
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "
";
echo <<<END
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;
// Because echo does not behave like a function, the following code is invalid.
($some_var) ? echo 'true' : echo 'false';
// However, the following examples will work:
($some_var) ? print 'true' : print 'false'; // print is also a construct, but
// it behaves like a function, so
// it may be used in this context.
echo $some_var ? 'true': 'false'; // changing the statement around
?>
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
SEE ALSO print(3), printf(3), flush(3), Heredoc syntax.
PHP Documentation Group ECHO(3)