A case statement will work in any Bourne type shell. This also makes it easy to test for an empty variable..
Code:
printf "Username: "
read _username
case $_username in
(*[![:alnum:]]*|"")
echo "invalid" ;;
(*)
echo "valid"
esac
Note that will also allow letters with accents like é and ã
To exclude those, you could use (*[!a-zA-Z0-9]*|"") but that may not work properly because of a locale collation order...
--
Also note hat the proper negation character with character sets used in patterns is ! not ^ (even though it probably will work too)
Last edited by Scrutinizer; 07-23-2014 at 02:34 PM..
Alright, I am stuck here.
I have this variable that stores the word = HELLO and I have converted it it to -----
I have asked user to input one character at a time. SAy, if they enter E.
Therefore, I need to search 2nd character and input E there.
makes it -E--- (other checkings have been... (2 Replies)
Hi,
For my bash script, terminal with bash is generate an OK output and program works right.
already,
terminal with ash have "line 48: syntax error: Bad substitution" output and program don't work.
:confused: (0 Replies)
Guys
I now have a script that's working in a BASH environment, however one line doesn't appear to be working on an embedded device that has a busybox therefore ASH shell. I've googled but there's very little I can find regarding the ASH shell.
In BASH the following line works...
if ] ;... (6 Replies)
I am trying to debug something using gdbserver, after the successful/YET REALLY SLOW debug session i see that the ash shell on the the target under debug is messed up.
Probably because gdbserver tries to open the core file which is binary. How do i recover from it?
Also any ideas to speed up... (2 Replies)
Hi All,
I have a script that I wrote on a bash shell, I use it to sort files from a directory into various other directories. I have an variable set, which is an array of strings, I then check each file against the array and if it is in there the script sorts it into the correct folder.
But... (5 Replies)
I wrote Bash script and now I want to convert it to Ash. One headache is this function:
do_adduser() {
setaddprompt
_arr_add=("Add manually" "Add via TXT" "return to main menu" "exit program")
select add_action in "${_arr_add}"
do
case "$REPLY" in
1)... (7 Replies)
hello everybody,
i'm a beginner in ash and i want to convert this bash script to ash.
this script send a xml file to a nagios server :
#!/bin/bash
PROGNAME=$(basename $0)
RELEASE="Revision 0.3"
print_release() {
echo "$RELEASE"
}
print_usage() {
echo ""
echo "$PROGNAME... (6 Replies)
Hi,
I am new in bash scripting. In my work, I provide support to several users and when I connect to their computers I use the same admin and password, so I am trying to create a script that will only ask me for the IP address and then connect to the computer without having me to type the user... (5 Replies)
hi,
i would like to create a bash script that check which port in my Linux server are closed (not in use) from a specific range, port range (3000-3010).
the print output need to be only 1 port, and it will be nice if the output will be saved as a variable or in same file.
my code is:
... (2 Replies)
Discussion started by: yossi
2 Replies
LEARN ABOUT DEBIAN
colorprint
COLORS(3) libbash colors Library Manual COLORS(3)NAME
colors -- libbash library for setting tty colors.
SYNOPSIS
colorSet <color>
colorReset
colorPrint [<indent>] <color> <text>
colorPrintN [<indent>] <color> <text>
DESCRIPTION
General
colors is a collection of functions that make it very easy to put colored text on tty.
The function list:
colorSet Sets the color of the prints to the tty to COLOR
colorReset Resets current tty color back to normal
colorPrint Prints TEXT in the color COLOR indented by INDENT (without adding a newline)
colorPrintN The same as colorPrint, but trailing newline is added
Detailed interface description follows.
Available colors:
Green
Red
Yellow
White
The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red).
FUNCTIONS DESCRIPTIONS
colorSet <color>
Sets the current printing color to color.
colorReset
Resets current tty color back to normal.
colorPrint [<indent>] <color>
Prints text using the color color indented by indent (without adding a newline).
Parameters:
<indent>
The column to move to before start printing. This parameter is optional. If ommitted - start output from current cursor position.
<color>
The color to use.
<color>
The text to print.
colorPrintN [<indent>] <color>
The same as colorPrint, except a trailing newline is added.
EXAMPLES
Printing a green 'Hello World' with a newline:
Using colorSet:
$ colorSet green
$ echo 'Hello World'
$ colorReset
Using colorPrint:
$ colorPrint 'Hello World'; echo
Using colorPrintN:
$ colorPrintN 'Hello World'
AUTHORS
Hai Zaar <haizaar@haizaar.com>
Gil Ran <gil@ran4.net>
SEE ALSO ldbash(1), libbash(1)Linux Epoch Linux