Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

how to grep and then to compare

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting how to grep and then to compare
# 1  
Old 05-15-2009
Data how to grep and then to compare
Hello to all,
i am new to scripting. I had to ques...1) If I had a variable $a which contains value i.e abc= jack
I want to grep it first and then put into the variable lets say $b.
Ques 2) If there is a file name.txt in which there are 15-20 names
-----name.txt------
jack|male|london
prink|male|hague
john|male|france
nincey|female|calif
-------------------
now I want to compare the value of $b with each name in name.txt
Thank you....
# 2  
Old 05-15-2009
Hi Ravi,

Code:
 
 awk -v search_strng=$ma  -F"|" '{for(i=1;i<=NF;i++){if($i==search_strng) print search_strng;print"found" } }' input_file

will search for the value in the file .But wht ur trying to acheive ?.. still i am not understnd..

regards
Sastry
# 3  
Old 05-15-2009
I want to read from the unix file....which would act as a database... so it will authenticate the username and password of user....so will it work or not...I would check it....So you returned a string "found"....please tell me how to call the next page after login authentication....
Please tell me what NF stands for and How I can grep the string after "=" sign.....
i.e. name= rohit
Thanks...
Regards,
Ravi
# 4  
Old 05-15-2009
Code:
 
I want to read from the unix file....which would act as a database... so it will authenticate the username and password of user....so will it work or not...I would check it....So you returned a string "found"....please tell me how to call the next page after login authentication....

really i did n't understand
might be u r trying something like php or html it seems.

Code:
 
Please tell me what NF stands for and How I can grep the string after "=" sign.....

NF stands for No.of fields in a line used by awk

if u want to check for "rohit"

Code:
 
cat inp_file.txt 
 
name=rohit 
 
awk -F"=" '{ if ( $2==search_string) print "found" }'  inp_file.txt

# 5  
Old 05-15-2009
yes you are right... I have a login page..through which I am sending form data by get method. In get method, data go by name=rohit and stored in default variable $QUERY_STRING. Now $QUERY_STRING is name=rohit.
now I want to grep rohit from itand then in the script I would check whether this user rohit exist or not by compairing it with the unix file. If the username exist then I would check the corresponding password.
If all the authentication is done then next page is called up else the error page is thrown back.....

Now please give some suggestion...as I still not able to do it...
Thanks & regards,
Ravi
# 6  
Old 05-15-2009
Ravi,

user_name=`echo $QUERY_STRING | awk -F"=" '{print $2}'`
Pass_word=`echo $QUERY_STRING1 | awk -F"=" '{print $2}'`

now search for user_name and password in the file as below.

ex: cat reference_file.txt

Name | Gender |Password
rohit|male|xxxx
robin|male|YYY

Code:
 
user_name="robin"
res1=`awk -F "|"  -v var_name=$user_name  '{if ($1==var_name){print "found";exit} }' reference_file.txt`

if res1 is "found" go and search the file again for password validation.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Compare data - Match first column and compare second

Hi guys, looking for some help with a way to compare data in two files but with some conditions. example, File 1 consists of site1,10.1.1.1 site2,20.2.2.2 site3,30.3.3.3 File 2 contains site1,l0.1.1.1 site2,50.1.1.1 site3,30.3.3.3 site4,40.1.1.1 I want to be able to match the... (1 Reply)
Discussion started by: mutley2202
1 Replies

2. Shell Programming and Scripting

Compare intervals (columns) from two files (awk, grep, Perl?)

Hi dear users, I need to compare numeric columns in two files. These files have the following structure. K.txt (4 columns) A001 chr21 9805831 9846011 A002 chr21 9806202 9846263 A003 chr21 9887188 9988593 A003 chr21 9887188 ... (2 Replies)
Discussion started by: jcvivar
2 Replies

3. Shell Programming and Scripting

script to grep a pattern from file compare contents with another file and replace

Hi All, Need help on this I have 2 files one file file1 which has several entries as : define service{ hostgroup_name !host1,!host5,!host6,.* service_description check_nrpe } define service{ hostgroup_name !host2,!host4,!host6,.* service_description check_opt } another... (2 Replies)
Discussion started by: namitai
2 Replies

4. Shell Programming and Scripting

Cannot compare argument in if statement in csh/grep command if argument starts with “-“

If ($argv == “-debug”) then Echo “in loop” Endif But this is not working. If I modify this code and remove “-“, then it works. Similarly I am getting problem using grep command also Grep “-debug” Filename Can someone please help me on how to resolve these... (1 Reply)
Discussion started by: sarbjit
1 Replies

5. Shell Programming and Scripting

Require compare command to compare 4 files

I have four files, I need to compare these files together. As such i know "sdiff and comm" commands but these commands compare 2 files together. If I use sdiff command then i have to compare each file with other which will increase the codes. Please suggest if you know some commands whcih can... (6 Replies)
Discussion started by: nehashine
6 Replies

6. UNIX for Dummies Questions & Answers

Using grep to compare JPEGs

Hi, I'm not sure if this is the right place but I'm a newb so it seemed right. I'm trying to write some code to organize JPEGs. Its a long story, but essentially, I need the program to tell me whether a particular jpeg is of 1) a sheet of paper (lets say its solid pink that takes up the entire... (3 Replies)
Discussion started by: Bengel
3 Replies

7. AIX

how to grep and compare timestamp in a file with the current date

I want to read a log file from a particular location.In the log file each line starts with timestamp.I need to compare the timestamp in the logfile with the current date.If the timpestamp in the log file is less than 4 hours then i need to read the file from that location.Below is the file... (1 Reply)
Discussion started by: achu
1 Replies

8. AIX

how to grep and compare timestamp in a file with the current date

I want to read a log file from a particular location.In the logfile , lines contains timestamp.I need to compare the timestamp in the logfile with the current date.If the timpestamp in the log file is less than 4 hours then i need to read the file from that location.Below is the file format.Please... (1 Reply)
Discussion started by: achu
1 Replies

9. UNIX for Dummies Questions & Answers

Compare 2 array files using grep

Using the bash shell I am trying to read in 2 files. The first file (file1) is a list of names to search for in (file2). If a name in file1 is found in file2 I want the entire line in file2 to be printed to an output file. File1 consists of a single column of names. File2 consists of several... (2 Replies)
Discussion started by: lanna001
2 Replies

10. UNIX for Dummies Questions & Answers

compare grep?

is there any way to compare two grep commands in an if statement? like: if grep blah = grep blah blah then is there a way to store the values of the greps and compare them? the greps are counting pattern matches in two different files and i need to make sure they match. (7 Replies)
Discussion started by: k@ssidy
7 Replies
Login or Register to Ask a Question