Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: while and do problems
Top Forums Shell Programming and Scripting while and do problems Post 302582560 by kshji on Friday 16th of December 2011 10:33:38 AM
Old 12-16-2011
Code:
# this is forever loop -almost, try to press CTRL-D ... loop will end
skipfield=Y
while [ $skipfield != "Y" ]
print "Do you want to skip this field Y/N?"
read skipfield
do
      :   # between do and done, like then and fi need 1-n commands
         #  :  = builtin nop command, return always true
done

Why ?
while command(s)
do
...
done
=> exit code of command, between while and do you can put command lines, but return code of last line is the important.
=> read some and press EOF = exit code is not 0 => while end

So, maybe this is better:
Code:
# this will end if you press Y or CTRL-D
while
     print "Do you want to skip this field Y/N?"
     read skipfield
     [ "$skipfield" != "Y" ]  # - without " " you get error if press ENTER or CTRL-D
do
      : 
done

Last edited by kshji; 12-16-2011 at 11:38 AM..
 

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

'make' problems (compliation problems?)

I'm trying to compile and install both most recent version of 'make' and the most recent version of 'openssh' on my Sparc20. I've run into the following problems... and I don't know what they mean. Can someone please help me resolve these issues? I'm using the 'make' version that was... (5 Replies)
Discussion started by: xyyz
5 Replies

2. UNIX for Dummies Questions & Answers

Few problems

Hi how can i do this? 1) shell script which writes data and time on to a file if filesystem exceeds 70% of space. 2) make entry to cron table to run a script every 15 mins. and can anyone expplain or demonstrate the difference between variables used in inside a function and outside a... (3 Replies)
Discussion started by: vivekshankar
3 Replies

3. UNIX for Advanced & Expert Users

Problems with Last

Hi, I,ve a Unixware 7.1.3 working correctly for two years ago, since a several weeks I've a problem with the command last . The information that this command return is : For example : 1.- The user root , time login : 12:15 h, time logoff 12:15 h (the real time is 14:00). Connected time is... (3 Replies)
Discussion started by: By_Jam
3 Replies

4. UNIX for Dummies Questions & Answers

problems with If

I'm having problems uses "if" it works fine when i do this. #!/bin/sh a= 10 qw= 2 w= 20 { if && ;then echo 3 fi } However if i try to do #!/bin/sh a= 10 (5 Replies)
Discussion started by: THM
5 Replies

5. UNIX for Dummies Questions & Answers

Problems with using less

Hello, I am having problems with using less on Linux version 2.6.18-92.1.17.el5 (brewbuilder@hs20-bc1-7.build.redhat.com) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)). I am using csh but have the same problems on bash. If I pipe something to less it works perfectly i.e. cat file | less... (9 Replies)
Discussion started by: z1dane
9 Replies

6. Shell Programming and Scripting

Problems with $?

Hello, I have the following piece of code that tries to retrieve the result of a .sh: . $HOME/prueba/Scripts/Recogida/recogida_sedra.sh resultado=$? echo "el resultado es : $resultado" if ; then echo "Se va a preprocesar los archivos" In the code of recogida.sh I have the... (8 Replies)
Discussion started by: danietepa
8 Replies

7. SuSE

Problems!!

good friends I am new to linux and I have the following TELNET service problem entering data devo telnet to a Windows server 2003 server and passes will not let me since the move to this server by telnet tells me the characters and thus invalidates me income, I have a service application... (1 Reply)
Discussion started by: pepetico
1 Replies

8. UNIX for Dummies Questions & Answers

Problems with IF Else ??!!

I have written the following code in cygwin to create directories in windows based on the parameter passed. echo $1 > fullpath path1=`awk -F / '{print $1}' $fullpath path2=`awk -F / '{print $2}' $fullpath if then if then if then continue ... (4 Replies)
Discussion started by: janardhanamk
4 Replies

9. Shell Programming and Scripting

About ps -ef and if-else problems

I'm new in Shell Programming and Scripting, I would like to ask some questions. ps -ef | grep $appNAme | grep -v grep <-- what will it return when it find a process is running? return 1 or 0 if then exit 1 <--- if = 0 , run this ? else continue <--- if = 1 , run this ?... (5 Replies)
Discussion started by: LoAlex
5 Replies

LEARN ABOUT MINIX

term

TERM(1) 						      General Commands Manual							   TERM(1)

NAME

       term - turn PC into a dumb terminal [IBM]

SYNOPSIS

       term [baudrate] [parity] [bits_per_character] [-dial_string] [device]

EXAMPLES

       term 2400	   # Talk to modem at 2400 baud

       term 1200 7 even    # 1200 baud, 7 bits/char, even parity

       term 8 9600 /dev/tty01
			   # 9600 baud, 8 bits/char, no parity, use tty01

       term -atdt12345 /dev/tty01
			   # Start with a command to dial out

DESCRIPTION

       Term  allows MINIX to talk to a terminal or modem over RS232 port 1.  The program first sets the baudrate, parity and character length, and
       then forks.  The parent sits in a loop copying from stdin (usually the console's keyboard), to the terminal  or	modem  (/dev/tty00).   The
       child  sits  in a loop copying from the terminal or modem (/dev/tty00) to standard output.  Thus when RS232 port 1 is connected to a modem,
       every keystroke typed on the keyboard is sent to the modem, and every character arriving from the modem is displayed.  Standard	input  and
       output  may  be redirected, to provide a primitive file transfer program, with no checking.  Any argument that starts with a minus ('-') is
       sent out to the modem, usually to dial out.  Term accepts several commands that are formed by typing the escape character,  CTRL-],  and  a
       letter.	 Type  CTRL-]?	to  see  a list of commands.  The subshell command is very important, it allows you to type in a ZMODEM command to
       transfer data.  Do not quit term to do this, or your modem line will be reset!  Term keeps the modem line open on file descriptor  9  while
       running the subshell, so you can type

	    <&9 >&9

       at the end of your ZMODEM command to connect it to the modem.

       Important  note: to use term, it is essential that /etc/ttytab is configured so that there is no shell hanging on /dev/tty01.  If there is,
       both the shell and term will try to read from /dev/tty01, and nothing will work.

SEE ALSO

       rz(1), sz(1).

																	   TERM(1)
All times are GMT -4. The time now is 07:08 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy