Hi,
I was wondering why ls * | echo does not print the contents of the directory to the screen? The way I see it, ls * returns a whole lot of information, and then we pipe all this info to echo, so surely it should all come to our screen!
Is there a serious flaw in my understanding?
... (3 Replies)
Hi,
I have heard you can use the echo command and piping together and was wondering if you can help me out.
I want to be able to use the echo command and pipe together to tell me how many files are in my current working directory, which have only my username read, write and execute... (4 Replies)
Alright, so the goal of my script is to read text from standard input and store it into a file using the ex-editor:
so far i've got this, but it doesn't work.
#!/bin/s
read text
ex $1 >> HERE
text
HERE
I don't get any errors either, so i don't know what i'm doing wrong. (7 Replies)
Hi, I'm trying to make a script which you type the year, select the month and day and then create the date in the format 2010-12-7.
#!/bin/bash
dia () {
echo " Seleccione el dia:"
select file in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Salir
do... (6 Replies)
I'm trying to pipe the output from a command into another using xargs but is not getting what I want. Running this commands:
find . -name '33_cr*.rod' | xargs -n1 -t -i cut -f5 {} | sort -k1.3n | uniq | wc -l
give the following output:
cut -f5 ./33_cr22.rod
cut -f5 ./33_cr22.rod
...
9224236... (7 Replies)
Hey,
I want to create a new file (devices) with the 39th and the 40th character of the line wich is in the array line and in the file drivers.
But unfortunately my try doesn't work:
sed -n '$linep' drivers | cut -c 39-40 | echo >>devices Perhaps one of you can help me. Thank you!
emoly
... (0 Replies)
Hey guys. I'm very new to Unix. I'm pretty fluent in Java and C, but I have never actually used Unix for anything. I am in an Operating Systems course now and I have an assignment to write a piece of code that involves forks and piping. I'm stuck.
1. The problem statement, all variables and... (6 Replies)
in cygwin, cron-config will ask two inputs: yes or no.
1st question, answer is no
2nd question, answer is yes
my script:
echo no | cron-config
how do i pass yes to 2nd question ? (4 Replies)
I was writing a shell script, where i need to run a command through script and then take input from user and later terminate it. i am not sure how to take input in a proper format immediately after a command.
example: below command line is used to import some data in to database (LDAP)... (3 Replies)
Hi Experts
I need your help to optimize my script to execute better as I have nearly 1M records & the script is taking close to 40 minutes to execute, so would need support on a faster alternative.
Input: file
{"house":"1024","zip":"2345","city":"asd","country":"zzv"}... (2 Replies)
Discussion started by: nk1984
2 Replies
LEARN ABOUT CENTOS
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)