Apply Regex to input read

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Apply Regex to input read
# 1  
Old 09-23-2007
Apply Regex to input read

Hi I am very new to Unix Shell. I have a question:

How do you check the input value against a reqex?

For example using korn Shell:

echo "Please enter revision month: \c"
read revmon

if $revmon | egrep -c = '[A-Z]{3}[0-9]{2}"'

echo "OK"

echo "PLease re-enter a valid revision month (e.g. SEP07)"


# 2  
Old 09-23-2007
With the Korn Shell you can use this:

print -n "Please enter revision month: "
read; case $REPLY in
([A-Z][A-Z][A-Z][0-9][0-9])print OK;;
(*)print KO;;

P.S. In ths case it's globbing, not RE's.

Last edited by radoulov; 09-23-2007 at 01:51 PM.. Reason: addition
# 3  
Old 09-23-2007
Thanks... it worked perfect.

BTW what does esac mean?
# 4  
Old 09-23-2007
The letters of the word case reversed Smilie
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Read input from Keyboard, do not proceed if no input

Hi, I am working on a script, which requests users to enter input. Ex: read -p "Please enter your email id:" email I don't want users skipping this entry, this has to be mandatory.I dont want to proceed without input. I can do a check if variable $email is empty and proceed if not.But, i... (7 Replies)
Discussion started by: aravindadla
7 Replies

2. Shell Programming and Scripting

Failure using regex with awk in 'while read file' loop

I have a file1.txt with several 100k lines, each of which has a column 9 containing one of 60 "label" identifiers. Using an labels.txt file containing a list of labels, I'd like to extract 200 random lines from file1.txt for each of the labels in index.txt. Using a contrived mini-example: $ cat... (8 Replies)
Discussion started by: pathunkathunk
8 Replies

3. Shell Programming and Scripting

Read Two Columns - Apply Condition on Six other columns

Hello All, Here is my input univ1 chr1 100 200 - GeneA 500 1 0 0.1 0.2 0.3 0.4 0.5 univ1 chr1 100 200 - GeneA 600 1 0 0.0 0.0 0.0 0.0 0.1 univ1 chr1 100 200 - GeneA 700 1 0 0.4 0.4 ... (2 Replies)
Discussion started by: jacobs.smith
2 Replies

4. Shell Programming and Scripting

Read input files and merge them in given order and write them to input one param or one file

Dear Friends, I am looking for a shell script to merge input files into one file .. here is my idea: 1st paramter would be outfile file (all input files content) read all input files and merge them to input param 1 ex: if I pass 6 file names to the script then 1st file name as output file... (4 Replies)
Discussion started by: hyd1234
4 Replies

5. UNIX for Dummies Questions & Answers

read regex from ID file, print regex and line below from source file

I have a file of protein sequences with headers (my source file). Based on a list of IDs (which are included in some of the headers), I'd like to print out only the specified sequences, with only the ID as header. In other words, I'd like to search source.txt for the terms in IDs.txt, and print... (3 Replies)
Discussion started by: pathunkathunk
3 Replies

6. UNIX for Dummies Questions & Answers

apply a function twice successively with the same input in awk program

Hi ! It is a general question. When an awk script looks like: #! bin/awk function example(i){ <body> } { example(1) #the function uses input_1 and return output_a } { example(2) #the function uses previous output_a as an input and returns... (15 Replies)
Discussion started by: beca123456
15 Replies

7. Shell Programming and Scripting

Help with Bash piped while-read and a read user input at the same time

Hi I am new to writing script and want to use a Bash Piped while-read and read from user input. if something happens on server.log then do while loop or if something happend on user input then do while loop. Pseudocode something like: tail -n 3 -f server.log | while read serverline || read... (8 Replies)
Discussion started by: MyMorris
8 Replies

8. Shell Programming and Scripting

print first few lines, then apply regex on a specific column to print results.

abc.dat tty cpu tin tout us sy wt id 0 0 7 3 19 71 extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 133.2 0.0 682.9 0.0 1.0 0.0 7.2 0 79 c1t0d0 0.2 180.4 0.1 5471.2 3.0 2.8 16.4 15.6 15 52 aaaaaa1-xx I want to skip first 5 line... (4 Replies)
Discussion started by: kchinnam
4 Replies

9. UNIX for Dummies Questions & Answers

Regex to match when input is not a certain string (can't use grep -v)

Hey everyone, Basically, all I'm looking for is a way to regex for not a certain string. The regex I'm looking to avoid matching is: D222 i.e. an equivalent of: awk '!/D222/' The problem is that I use this in the following command in a Bash script: ls ${source_directory} | awk... (1 Reply)
Discussion started by: kdelok
1 Replies

10. Shell Programming and Scripting

SED + Regex + SQL Input file

Here's the problem... I have a mysqldump file and I need to put single quotes around the date/time timestamp. So for example I have a line like: INSERT INTO attachments VALUES (1,182,2004-08-06 09:24:04,'description'... and I need it to become INSERT INTO attachments VALUES... (10 Replies)
Discussion started by: primal
10 Replies
Login or Register to Ask a Question