Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

How to use expr INDEX with pipe?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How to use expr INDEX with pipe?
# 1  
Old 07-22-2013
How to use expr INDEX with pipe?
Hi,

I need to use the output of previous command in the next command while using pipe.

Like I am reading a file then I am fetching first line from a file and then I want to know the location of character 'e' in that line.

Code:
cat filename|sed -n 1p|expr index ------ e

In above example I don't know what to write at the place of '-----' Smilie

Please suggest how can I do that. I have googled it but found nothing.
# 2  
Old 07-22-2013
try..

Code:
 
 awk 'NR==1{print index($0,"e")}' filename

# 3  
Old 07-23-2013
Code:
echo $(expr index "$(sed -n '1p;q' filename)" e)

Last edited by ygemici; 07-23-2013 at 09:20 AM..
# 4  
Old 07-23-2013
Adding a q/exit command would improve the sed/awk script. There's no need to read anything more after printing the first line.

Regards,
Alister
# 5  
Old 07-23-2013
Quote:
Originally Posted by alister
Adding a q/exit command would improve the sed/awk script. There's no need to read anything more after printing the first line.

Regards,
Alister
yepSmilie
# 6  
Old 07-24-2013
Quote:
Originally Posted by ygemici
Code:
... sed -n '1p;q' ...

Or, more simply:
Code:
sed q

Regards,
Alister
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to ignore Pipe in Pipe delimited file?

Hi guys, I need to know how i can ignore Pipe '|' if Pipe is coming as a column in Pipe delimited file for eg: file 1: xx|yy|"xyz|zzz"|zzz|12... using below awk command awk 'BEGIN {FS=OFS="|" } print $3 i would get xyz But i want as : xyz|zzz to consider as whole column... (13 Replies)
Discussion started by: rohit_shinez
13 Replies

2. Shell Programming and Scripting

Error with expr - "expr: syntax error"

Hi All, I'm writing a shell script in KSH, where I want to store the filename, total record count and actual record count of all the source files. The source files reside in 4 different sub-folders under the same root folder. Below is code: #!/usr/bin/ksh... (6 Replies)
Discussion started by: jagari
6 Replies

3. Shell Programming and Scripting

Replace pipe with Broken Pipe

Hi All , Is there any way to replace the pipe ( | ) with the broken pipe (0xA6) in unix (1 Reply)
Discussion started by: saj
1 Replies

4. Shell Programming and Scripting

test expr VS [ expr ]

What is the difference between test expr VS . For example : if test 5 -eq 6 echo "Wrong" and if echo "Wrong" bot will give the same output as Wrong. Now, what is the difference between these two? though they are producing the same result why we need two? Any answer will be... (2 Replies)
Discussion started by: ashok.g
2 Replies

5. Shell Programming and Scripting

Sort from start index and end index in line

Hi All, I have a file (FileNames.txt) which contains the following data in it. $ cat FileNames.txt MYFILE17XXX208Sep191307.csv MYFILE19XXX208Sep192124.csv MYFILE20XXX208Sep192418.csv MYFILE22XXX208Sep193234.csv MYFILE21XXX208Sep193018.csv MYFILE24XXX208Sep194053.csv... (5 Replies)
Discussion started by: krish_indus
5 Replies

6. Red Hat

how to use expr

i am new to shell programming, currently using redhat linux of version 2.4.20-8. i have problem in executing expr command in the following shell script $ x=5 $ x='expr $x + 1' $ echo $x the output is displaying always expr $x + 1 Pls guide me for the above query (3 Replies)
Discussion started by: saikumarm80
3 Replies

7. Shell Programming and Scripting

Find first digit in string using expr index

I have looked for hours for an answer, so I have decided to request your guidance. I want to substract the first number (series of digits) contained in a string. This string is the output of another command. The substring (number) can be located at any position inside the string. I want to... (4 Replies)
Discussion started by: jcd
4 Replies

8. UNIX for Dummies Questions & Answers

wh inode index starts from 1 unlike array index (0)

brothers why inode index starts from 1 unlike array inex which starts from 0 its a question from the design of unix operating system of maurice j.bach i need to know the answer urgently...someone help please (1 Reply)
Discussion started by: sairamdevotee
1 Replies

9. Filesystems, Disks and Memory

why the inode index of file system starts from 1 unlike array index(0)

why do inode indices starts from 1 unlike array indexes which starts from 0 its a question from "the design of unix operating system" of maurice j bach id be glad if i get to know the answer quickly :) (0 Replies)
Discussion started by: sairamdevotee
0 Replies

10. UNIX for Dummies Questions & Answers

expr

Hello! I want to evaluate some mathematical expressions in a script and I try to use 'expr' command. Unfortunatally, when I have, for example, expr 8.2 + 6 the result is 'expr: non-numeric argument' Why ? I work on SunOs 5.7. Thanks in advance Nathe (5 Replies)
Discussion started by: Nathe
5 Replies
Login or Register to Ask a Question