Using Grep to Define a Variable


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Using Grep to Define a Variable
# 1  
Old 10-12-2001
Using Grep to Define a Variable

I am using korn shell unix.

I have a script that I am working with to do a check for me using a text file.



#finds "Time" from the text file and cuts the second field from the #line

A= grep Time test.txt | cut -f2


# the "#Missing" is being pulled from the second field of the text #file

if [ "$A" = #Missing ]
then
echo "page me"
fi



My problem is that I am unable to get the 'echo "page me"' to echo back onto the screen. This tells me that the check isn't successful- or at least that is what I think it is telling me.

My if statement may be incorrect- I've tried '-eq', but no luck there either.

I'm also not certain if I can use grep to try and define a variable. I've even attempted to use awk. Everything works on the command line, by itself (like running the grep command).

Anyone have any ideas? I'm pretty new at Unix.

Thanks,

Chris
# 2  
Old 10-12-2001
I tried it this way...

I'm sure there are 100 different ways of accomplishing this, but this worked for me:

#!/bin/ksh

A=`grep Time test.txt | cut -f2`

if [ $A = \#Missing ]
then
echo "page me"
fi
 
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to define two digits variable in shell script?

Dear Shell script Experts, I am working on shell script which is defined here, qsub_seq.csh . The purpose of this script is to read few input files (with defined starting index and last index) and make processing faster over server. For some task, I had 1064 of input files, so I wrote another... (8 Replies)
Discussion started by: emily
8 Replies

2. UNIX for Dummies Questions & Answers

How to prompt user to define a variable?

Hi everyone, Is it possible to define blank vaianbles and prompt user to fill them during the script execution? A very simple example: INPUT= OUTPUT= cut -f1-4 $INPUT | sed 's/hello/goodbye/g' | sort -uV > $OUTPUTThank you in advance! Best wishes (2 Replies)
Discussion started by: lsantome
2 Replies

3. Shell Programming and Scripting

Define variable from file.

HI I have file A.txt _1A _2A _3A _4A I want define all as different variable. $1A=_1A $2B=_2A $3C=_3A $4D=_4A Now i can use any variable in my script. (3 Replies)
Discussion started by: pareshkp
3 Replies

4. Shell Programming and Scripting

In Perl can i define a hash with value as variable?

Hi, Is it possible in perl to have a hash defined with variables as theirs key values, like: %account = ('username' => 'boy', 'password' => $password); Thanks (1 Reply)
Discussion started by: zing_foru
1 Replies

5. Shell Programming and Scripting

question about define variable.

Hi, Unix Gurus, In our existing file, there is a script like #!/bin/sh step=${1:-0} cur_step=10 if ... My question is what's "${1:-0}" mean? I know it defines a variable but I don't know what's (1:-0) mean? :wall: Thanks in advance. (2 Replies)
Discussion started by: ken002
2 Replies

6. Shell Programming and Scripting

bash - define a variable

Hello, I would like to define a variable based on another variable: a=5 b$a=100 This does not work. What is the right way to do it? Thanks ---------- Post updated at 07:37 PM ---------- Previous update was at 07:33 PM ---------- Found my answer with the search function (did not... (0 Replies)
Discussion started by: jolecanard
0 Replies

7. Shell Programming and Scripting

How to define a variable with variable definition is stored in a variable?

Hi all, I have a variable say var1 (output from somewhere, which I can't change)which store something like this: echo $var1 name=fred age=25 address="123 abc" password=pass1234 how can I make the variable $name, $age, $address and $password contain the info? I mean do this in a... (1 Reply)
Discussion started by: freddy1228
1 Replies

8. UNIX for Dummies Questions & Answers

define length of variable

I have a variable with a value of "05". When I add one to that variable, using the command: CURR_YY=`expr $CURR_YY + 1`, I get the value of "6", losing the leading zero (which is needed for passing to another script). How do I keep the leading zero? Thank you! (10 Replies)
Discussion started by: cbarker
10 Replies

9. Shell Programming and Scripting

How to define two variable in foreach command??

Hello, I just want to know how If it's possiple to define 2 variable using foreach command ??? I have directory inside that directory around 1000 file, I want to rename all of this files to something I have it in a list. Example :- ------This is what in my directory---------- d1 d2... (14 Replies)
Discussion started by: geoquest
14 Replies
Login or Register to Ask a Question