How to read data from a text file?

Vipul_sharma11 · 10-13-2014, 01:44 AM

Hi All,

I have a text file with Name and Address in it.

<Name>|<Address>

Amit|32, Rajpura Road, Dehradun
Sumit|123, Shahbad, Ambala

and so on....

I want to fetch the address when I enter the name.

Can anyone help me please?

pan64 · 10-13-2014, 01:46 AM

just try the grep command, see the man page or look for tutorials and/or examples

715509387 · 10-13-2014, 01:56 AM

try it

Code:

[root@svn252 ~]# cat URFILE 
Amit|32, Rajpura Road, Dehradun
Sumit|123, Shahbad, Ambala
[root@svn252 ~]# awk -F'|' '$1=="Sumit"{print $2}' URFILE 
123, Shahbad, Ambala
[root@svn252 ~]# awk -F'|' '$1=="Amit"{print $2}' URFILE 
32, Rajpura Road, Dehradun
[root@svn252 ~]#

Vipul_sharma11 · 10-13-2014, 01:57 AM

hi,

thanks for the suggestion.

i want to read input from user and then take address from file.

can you please tell me how to read the file line by line?

nisagnel · 10-13-2014, 02:15 AM

Hi Vipul,

You can do it using bash script like below.
Assume that you have file "details.txt" which has name and address.

#!/bin/bash

## read name from the user
read NAME

## now grep the name from the details.txt
cat details.txt | grep $NAME

..hope this will help you.

rupal.chawla · 10-13-2014, 02:58 AM

You can try using 'grep' command

Eg. your details are in file 'text.txt'

type in command:
cat text.txt| grep "name"

Output:
Name Address

Happy Learning

---------- Post added 10-13-14 at 02:58 AM ----------

You can try using 'grep' command

Eg. your details are in file 'text.txt'

type in command:
cat text.txt| grep "name"

Output:
Name Address

Happy Learning

SAbhi · 10-13-2014, 03:50 AM

Since you didnt mentioned what you tried, i will take it as after a small guidance you would try it yourself by looking into some examples:

So i would prefer something like :

Code:

#declare filename as variable $filename
#read a variable say $inputname
#use grep to fetch users all details, instead of using cat. Avoiding a useless use of commands
grep $inputname $filename
#you can use awk, cut and further more commandsdepending upon your requirement, see man pages and examples as 'pan64' told.
#if there is any iteration needed you can use while loop to do the due
while read $variable; do something_with_variable;done< $filename

let us know if you ty and fail with what you tried, we can help suggesting better option.