Visit The New, Modern Unix Linux Community

Get the exact match of the string!

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Get the exact match of the string!
# 1  
Get the exact match of the string!

Hi All,

I am breaking my head in trying to get a command that will exactly match my given string. I have searched net and found few of the options -

grep -F $string file
grep -x $string file
grep "^${string}$" file
awk '/"${string}"/ {print $0}' file

strangely nothing seems to work in my script?! I'm not sure what the problem is, I'm calling this command in a while loop

while read string
 <above commands>
done < file

and the $string is not getting expanded in some cases while in some cases it attaches ^$ to the string and nothing "grep"Smilie. Please tell me what I'm doing wrong.

# 2  
Can you post sample data and value assigned to variable "string"
# 3  
Your awk won't work as a) the variable is not expanded within single quotes b) the /.../ needs a string constant not a variable (while when expanded between double quotes there's a chance to work).
# 4  
grep -F $string file                 # The variable needs to be put in double quotes 
grep -x $string file                 # This is a whole line match, but $string is interpreted as a regex 
                                     # and the variable needs to be put in double quotes 
grep "^${string}$" file              # This is a whole line match, but $string is interpreted as a regex
awk '/"${string}"/ {print $0}' file  # This will not work, see RudiC's comments

Also make sure there are no CR characters in your file (dos format) or none of the exact line matching will work...

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #980
Difficulty: Easy
Releases of Mac OS X from 1999 to 2005 ran on the Intel-based Macs of that period.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk to update file based on partial match in field1 and exact match in field2

I am trying to create a cronjob that will run on startup that will look at a list.txt file to see if there is a later version of a database using database.txt as the source. The matching lines are written to output. $1 in database.txt will be in list.txt as a partial match. $2 of database.txt... (2 Replies)
Discussion started by: cmccabe
2 Replies

2. Shell Programming and Scripting

Match exact String with sed command

I have a workaround to the problem i m posting, however if someone wants to look at my query and respond ... i will appreciate. This is in reference to this thread -> I have data.txt as... (11 Replies)
Discussion started by: mohtashims
11 Replies

3. Shell Programming and Scripting

Help match the exact string

I just want to match "binutils1_test" only, and print the match line only lyang001@lyang001-OptiPlex-9010:/tmp$ cat file zbinutils1_test bbinutils1_test binutils1_test w-binutils1_test lyang001@lyang001-OptiPlex-9010:/tmp$ cat file |grep -w 'binutils1_test' ... (7 Replies)
Discussion started by: yanglei_fage
7 Replies

4. Shell Programming and Scripting

grep regex, match exact string which includes "/" anywhere on line.

I have a file that contains the 2 following lines (from /proc/mounts) /dev/sdc1 /mnt/backup2 xfs rw,relatime,attr2,noquota 0 0 /dev/sdb1 /mnt/backup xfs rw,relatime,attr2,noquota 0 0 I need to match the string in the second column exactly so that only one result is returned, e.g. > grep... (2 Replies)
Discussion started by: jelloir
2 Replies

5. Shell Programming and Scripting

Finding exact match string

Hi All, I'm writing unix script, it should find exact matching in search string. Looks simple but when i started i'm stuck to find the exact match character string. The unix script reads the records from DB Table. The table will have values something likes these Feed : A Feed File name :... (3 Replies)
Discussion started by: luckybalaji
3 Replies

6. Shell Programming and Scripting

exact string match ; search and print match

I am trying to match a pattern exactly in a shell script. I have tried two methods awk '/\<mpath${CURR_MP}\>/{print $1 $2}' multipath perl -ne '/\bmpath${CURR_MP}\b/ and print' /var/tmp/multipath Both these methods require that I use the escape character. I am guessing that is why... (8 Replies)
Discussion started by: bash_in_my_head
8 Replies

7. Shell Programming and Scripting

sed to match only exact string only in all occurences

Dear Friends, Anybody knows how to match exact lines only in multilinear. Input file: apple orange orange apple apple orange Desired output: fruit orange apple fruit i used the command (1 Reply)
Discussion started by: vasanth.vadalur
1 Replies

8. Shell Programming and Scripting

Searching for exact match in a string ??

Hi I have a string of the form XY_X1998.10.500. I want to check in a script that the middle part is always 10. How to achieve this? e.g the input can be XY_X1998.20.500 OR XY_X1998.50.500 OR XY_X1998.10.500. I have to print Yes everytime the middle value is 10 and NO when the middle... (2 Replies)
Discussion started by: skyineyes
2 Replies

9. UNIX for Dummies Questions & Answers

exact string match in a word

Hi all, Is anyone able to help with the following query? I have an input file with several lines of words, e.g. "hellolaylahello" "hellohellohellolayla" I want to search for the exact string "hello" in each line and display: 2 "hellolaylahello" 3 "hellohellohellolayla" I... (11 Replies)
Discussion started by: dr_sabz
11 Replies

10. Shell Programming and Scripting

How do I search a File for a string exact match

Hi, Can you help please. I have the following comand: if ]; then l_valid_string="Y" fi The problem I am trying to solve is that my l_string = ABC and my file contains ABC ABC_EFG I only want back the value ABC exact match. (3 Replies)
Discussion started by: CAGIRL
3 Replies

Featured Tech Videos