Sponsored Content
Top Forums Shell Programming and Scripting Force Input in User Defined Variable Post 302122210 by cfajohnson on Tuesday 19th of June 2007 04:10:52 PM
Old 06-19-2007
Quote:
Originally Posted by earnstaf
In a line such as:

Code:
echo -n "How many days back would you like to check? "; read days

How can I ensure that the user has a.) entered a number between 1-30 (not 0 or 31+) and b.) has not just hit enter (ie set it to "") and if it's entered wrong, how do I start the if statement over?

I think I figured out my first question while typing. I have:
EDIT: I didnt figure it out at all Smilie
Code:
if [ "$days" != [1-30] ]; then  #this doesnt work
echo "Please specify a number between 1 and 30."
echo -n "How many days back would you like to check? "; read days
else
...
fi

If they enter it wrong again, it errors. Is there a better way to do this?

Code:
while :
do
  printf "Enter day of month (1 - 30): "
  read day
  case $day in
    *[^0-9]* | "" | ???* )
       printf "Invalid number: \"%s\"\nPlease try again.\n\n" "$day"
       continue
       ;;
  esac
  if [ $day -gt 30 -o $day -lt 1 ]
  then
     printf "\nInvalid number: \"%s\"\nPlease try again.\n\n" "$day"
     continue
  fi
  break
done

 

10 More Discussions You Might Find Interesting

1. AIX

User defined signal 1

Hi, I am just running a incremental back-up on one of my server. But these days It abrubtly fails with below error. ========== User defined signal 1 =========== When I rerun the back-up, It completed successfully.Earlier this was not happening. Any Idea, what could be the problem... (0 Replies)
Discussion started by: nitesh_raj
0 Replies

2. UNIX for Dummies Questions & Answers

User defined service

I want to add a new IP service which executes a script on SCO OS5. I have amended /etc/services and added to port number (3333) I have amended /etc/inetd.conf and added a line for this service but I can't get it to execute my own shell script When I telnet to the IP address on port 3333 I... (1 Reply)
Discussion started by: markdrury
1 Replies

3. Linux

environment variable is not defined

moved to correct thread (0 Replies)
Discussion started by: alien12
0 Replies

4. Shell Programming and Scripting

Replace variable with a user defined variable

I have a file that has a list of entries in a column x z z z x y z The column can have any length and any number of any strings. I need to replace each unique string with a user defined number. I can filter the unique entries out using awk '{if (NF==5) print $2}' file | uniq | nl >... (1 Reply)
Discussion started by: ce124
1 Replies

5. Shell Programming and Scripting

need help with User Defined Function

Dear Friends, I need a help regarding User defined function in shell script. My problem is as follows: my_func.sh my_funcI(){ grep 'mystring' I.dat } my_funcQ(){ grep 'mystring' Q.dat } myfuncI myfuncQ But As both the function has same function only the... (11 Replies)
Discussion started by: user_prady
11 Replies

6. Shell Programming and Scripting

Unable to add user defined variable

Hi, I have a user defined variable _TIME1=xxx I am using awk command for pattern matching. cat $_LOCATION/catalina.txt | awk '/^`$_TIME1`:??:??/' It not taking the value of $_TIME! eg:I am using the command to get all the patter from 12:00:00 to 12:59:59 The user defined variable... (2 Replies)
Discussion started by: ahamed
2 Replies

7. UNIX for Dummies Questions & Answers

user defined commands

Hi, i would like to create user defined commands. e,g: if an user executes , mkdircd test then a directory called test should be created and it should be cd to test. How i can create the command mkdircd with below action: mkdir $1 && cd $1. Please help me in achieving this (7 Replies)
Discussion started by: pandeesh
7 Replies

8. UNIX for Dummies Questions & Answers

print user variable input

this may be basic thing for everyone here, but i cant push awk to print the variable user input which is INS, please help. code: INS=$1 printf '\n' symdg list | grep $INS-clone | awk -v i=$INS '{ID=substr($4,9,4)}{print "Device Group: "$1,"at Array "ID,i}' output: $ ./test.sh patty ... (5 Replies)
Discussion started by: prodigy06
5 Replies

9. Shell Programming and Scripting

Question about awk - create a user-defined variable

Hi, guys, The content of file is below (from <UNIX® Shells by Example Fourth Edition>): My code is below: gawk -F'' ' { OFS = "****"; $3 = "(904)"; $8 = $5 + $6 + $7; print } ' lab3.data The result is below: So, where is the $1? Why is the variable $8 located at the wired position? (3 Replies)
Discussion started by: franksunnn
3 Replies

10. Shell Programming and Scripting

Doing math using user defined input and system environment variables

Hi, I need some help to setup some environmental variables. for example...Get A -> userdefined/user input B -> a number. c -> system variable...for example $GETCONF PAGE_SIZE E = do some math using bc display a message "The value is E" setup the system/kernel paramter sysctl -p... (3 Replies)
Discussion started by: saravanapandi
3 Replies
holidays(4)							   File Formats 						       holidays(4)

NAME
holidays - prime/nonprime table for the accounting system SYNOPSIS
/etc/acct/holidays DESCRIPTION
The /etc/acct/holidays file describes which hours are considered prime time and which days are holidays. Holidays and weekends are con- sidered non-prime time hours. /etc/acct/holidays is used by the accounting system. All lines beginning with an "*" are comments. The /etc/acct/holidays file consists of two sections. The first non-comment line defines the current year and the start time of prime and non-prime time hours, in the form: current_year prime_start non_prime_start The remaining non-comment lines define the holidays in the form: month/day company_holiday Of these two fields, only the month/day is actually used by the accounting system programs. The /etc/acct/holidays file must be updated each year. EXAMPLES
Example 1: Example of the /etc/acct/holidays file. The following is an example of the /etc/acct/holidays file: * Prime/Nonprime Table for the accounting system * * Curr Prime Non-Prime * Year Start Start * 1991 0830 1800 * * only the first column (month/day) is significant. * * month/day Company Holiday * 1/1 New Years Day 5/30 Memorial Day 7/4 Indep. Day 9/5 Labor Day 11/24 Thanksgiving Day 11/25 day after Thanksgiving 12/25 Christmas 12/26 day after Christmas SEE ALSO
acct(1M) SunOS 5.10 28 Mar 1991 holidays(4)
All times are GMT -4. The time now is 11:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy