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 POSIX
escape
escape(1) Mail Avenger 0.8.3 escape(1)NAME
escape - escape shell special characters in a string
SYNOPSIS
escape string
DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result.
EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string:
$ var='; echo gotcha!'
$ eval echo hi $var
hi
gotcha!
$
Using escape, one can avoid executing the contents of $var:
$ eval echo hi `escape "$var"`
hi ; echo gotcha!
$
A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For
example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient:
#!/bin/sh
formail -x to -x cc -x resent-to -x resent-cc
| fgrep "$1" > /dev/null
&& exit 0
echo "<$1>.. address does not accept blind carbon copies"
exit 100
To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt
script:
bodytest reject_bcc `escape "$RECIPIENT"`
SEE ALSO avenger(1),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 escape(1)