read -p 'Enter any number, please: ' number
sleep 1
number=$( tr -d 0-9 <<< "$number" )
test -z "$number" &&
echo "Thank you" ||
echo "This is not a number"
Actually you could avoid calling external commands in this case:
Code:
read -p 'Enter any number, please: ' number
sleep 1
test -z "${number//[0-9]}" &&
echo "Thank you" ||
echo "This is not a number"
P.S. The code above uses non standard shell features, but that shouldn't be
a problem, considering that the original post uses non standard features too
I'm nearly finished my program i've got everything in place and than when i run it it comes back with the reply mv: command not found. This is the code that seems to be causing the problem.
elif
then
echo "There are more than one '$1' files in the system."
echo "Please... (2 Replies)
hi forum
i beginning with script and i want test un null variable in a schell
i just don t know the syntax here is a litle example
y=test
echo $y
unset y
echo $y (so here Y = Null)
if Y=Null
then
echo "y is null"
exit
fi (1 Reply)
hi folks,
i've got a blank hp visualize C3000 workstation and installed HP-UX 11.11. When I want to start X, I get the following error message:
# X
Fatal server error:
Couldn't open X pointer device! Is one attached?
I've connected an mouse and a keyboard with an usb/ps2 connector.... (5 Replies)
korn shell
If
then
update_smartcare_user_password "$u_id"
else
echo "Not a database user"
fi
i get this error
Syntax error at line *** : `then' is not expected.
what should i do.
I want to check whether $a is null or not. (2 Replies)
Hey,
I'm currently getting into some kernel module progamming. As a little exercise I want to read the headers out of an ELF file. My code is very simple, here is the important part:
struct file *fp;
/* ... */
fp = filp_open("some/file/on/my/pc", O_RDONLY, 0);
if(fp == NULL) {
... (15 Replies)
Hi.
Here is beginning of my script
#!/usr/local/bin/expect --
set timeout 15
spawn /usr/local/account.sh -n modify
expect "Password:" {send "mypassword\r"}
But due to some terminal control sequences (or something else, dunno exactly) my password prompt is looking like this:
and expect... (3 Replies)
Good afternoon,
I am tearing hair out over this. It should be so simple. I have an if statement to evaluate whether or not replication is working. I am testing variables from mysql to see if they are both "Yes". I have put some echo statements in to see how far the code proceeds. It always... (6 Replies)
Hi ! :)
I made this :
#!/bin/bash
rsa_dir="/etc/openvpn/easy-rsa/"
rsa_key_dir="/etc/openvpn/easy-rsa/keys/"
ccd_dir="/etc/openvpn/ccd/"
regex_special_char=''
cd $rsa_dir
while
read -p "Please can you enter the vpn's username : " username
] || ] || ] || ]
do
echo "Your entry... (10 Replies)
I have vmware on my windows PC ( hostname : acer ).
vmware has RHEL 7 ( hostname : rhel7 ) installed recently.
RHEL IP configuration
IP : 192.168.5.128
Netmask : 255.255.255.0
ssh to rhel7 works from acer using putty
resolve.conf
cat /etc/resolv.conf
nameserver 192.168.5.1
host... (12 Replies)
Discussion started by: hiten.r.chauhan
12 Replies
LEARN ABOUT V7
vp
VP(4) Kernel Interfaces Manual VP(4)NAME
vp - Versatec printer-plotter
DESCRIPTION
Vp0 is the interface to a Versatec D1200A printer-plotter with a Versatec C-PDP11(DMA) controller. Ordinarily bytes written on it are
interpreted as ASCII characters and printed. As a printer, it writes 64 lines of 132 characters each on 11 by 8.5 inch paper. Only some
of the ASCII control characters are interpreted.
NL performs the usual new-line function, i.e. spaces up the paper and resets to the left margin. It is ignored however following a CR
which ends a non-empty line.
CR is ignored if the current line is empty but is otherwise like NL.
FF resets to the left margin and then to the top of the next page.
EOT resets to the left margin, advances 8 inches, and then performs a FF.
The ioctl(2) system call may be used to change the mode of the device. Only the first word of the 3-word argument structure is used. The
bits mean:
0400 Enter simultaneous print/plot mode.
0200 Enter plot mode.
0100 Enter print mode (default on open).
040 Send remote terminate.
020 Send remote form-feed.
010 Send remote EOT.
04 Send remote clear.
02 Send remote reset.
On open a reset, clear, and form-feed are performed automatically. Notice that the mode bits are not encoded, so that it is required that
exactly one be set.
In plot mode each byte is interpreted as 8 bits of which the high-order is plotted to the left; a `1' leaves a visible dot. A full line of
dots is produced by 264 bytes; lines are terminated only by count or by a remote terminate function. There are 200 dots per inch both ver-
tically and horizontally.
When simultaneous print-plot mode is entered exactly one line of characters, terminated by NL, CR, or the remote terminate function, should
be written. Then the device enters plot mode and at least 20 lines of plotting bytes should be sent. As the line of characters (which is
20 dots high) is printed, the plotting bytes overlay the characters. Notice that it is impossible to print characters on baselines that
differ by fewer than 20 dot-lines.
In print mode lines may be terminated either with an appropriate ASCII character or by using the remote terminate function.
FILES
/dev/vp0
SEE ALSO opr(1)VP(4)
04-14-2012
