5

What's wrong with my assignment

view full story
linux-howto

http://www.unix.com – Code: lyang0@lyang0-OptiPlex-755:~$ tr 'A-Z' 'a-z' <<< `printf 'DE:EF:BE:%02X:%02X:%02X\n' $((RANDOM%256)) $((RANDOM%256)) $((RANDOM%256))` de:ef:be:20:a2:e8 lyang0@lyang0-OptiPlex-755:~$ GUEST_MAC=`tr 'A-Z' 'a-z' <<< `printf 'DE:EF:BE:%02X:%02X:%02X\n' $((RANDOM%256)) $((RANDOM%256)) $((RANDOM%256))`` bash: command substitution: line 1: syntax error near unexpected token `newline' bash: command substitution: line 1: `tr 'A-Z' 'a-z' <<< ' DE:EF:BE:%02X:%02X:%02X\n: command not found (HowTos)

suki's picture
Submitted by suki on 12/23/2012 – Made popular on 12/23/2012

Stories similar to What's wrong with my assignment

Code: lyang0@lyang0-OptiPlex-755:~$ ./test.sh . lyang0@lyang0-OptiPlex-755:~$ cat test.sh #!/bin/bash echo `dirname $0` lyang0@lyang0-OptiPlex-755:~$ pwd /home/lyang0 it doesn't get "/home/lyang0" and only when run /home/lyang0/test.sh it will get, but how can I do, then it can get the real full path anytime?

sed for delete the 2th 3th 4th 39 weeks 4 days ago

Hi expert

The delete the 2th

Code: lyang0@lyang0-OptiPlex-755:~/del$ sed 's/[a-zA-Z]*//2p' 9 to delete from 2th

Code: lyang0@lyang0-OptiPlex-755:~/del$ sed 's/[a-zA-Z]*//2gp' 9 but if I want to delete 2th 3th 4th

or

but if I want to delete 2th 15th

how could I do?

Code: lyang0@lyang0-OptiPlex-755:/tmp$ ./fg.sh ............................... ssh to the guest ..... ............................... ./fg.sh: 18: :ls: not found

Code: lyang0@lyang0-OptiPlex-755:/tmp$ cat fg.sh #!/bin/sh DEFAULT_CMD="ls /boot/" ssh_to_guest() {         echo "..............................."         echo &quo

toys

This one's a very close variation on Print a horizontal line (credit goes to those guys). You may wish to read it first, as well as The printf command. We're basically exploiting the same printf field width specifier concept to truncate the values of a sequence expansion.

random number needed 46 weeks 1 day ago

I need a command line script that will generate a random integer between 1 and 6. I'm using Ubuntu with bash. I was working on this a couple of months ago using 'bc', but never got it to work completely. I've since forgotten where I got to.

Python help please 35 weeks 1 day ago

I'm getting weird syntax's like print "" Syntax Error: invalid syntax

also getting

time.sleep(1) Syntax Error: invalid syntax

elif skill==2: Syntax Error: invalid syntax

Code: #Another version of the "adventure game" #September 14, 2012

import random, os, time, string os.system("color 1C")  # green(2) text on white(F) background

#Warr

First off, here is a fast / reliable random string function for scripts or libraries which can optionally assign directly to a variable.

# Print or assign a random alphanumeric string of a given length. # rndstr [ -v var ] len # Bash-only rndstr() if [[ $FUNCNAME == "${FUNCNAME[1]}" ]]; then # On recursion, this branch unsets the outer scope's locals and assigns the result.

How to user /dev/(u)random 34 weeks 1 day ago

How can I use /dev/(u)random on Ubuntu or any *nix sistems ? I searched at google but I can't find how to :( I tried this but it says permission denied. Note : I also tried as root.

/dev/(u)random sudo /dev/(u)random sudo -s;/dev/(u)random

Solution :

dd if=/dev/urandom of=~/urandom_test count=4 bs=1024

First off, here is a fast / reliable random string function for scripts or libraries which can optionally assign directly to a variable.

# Print or assign a random alphanumeric string of a given length. # rndstr len [ var ] function rndstr { if [[ $FUNCNAME == "${FUNCNAME[1]}" ]]; then unset -v a printf "$@" elif [[ $1 != +([[:digit:]]) ]]; then return 1 elif