Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

How to append a string by cat and redirect to other file?

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers How to append a string by cat and redirect to other file?
# 1  
Old 04-17-2015
How to append a string by cat and redirect to other file?
Hi,

when I do cat for kernel parameters

Code:
 
 
cat /proc/sys/kernel/sem >> /etc/sysctl.conf
4096    4096    32      128

The above command working with out any doubt

but I want to pass it like below, need to append "kernel.sem =" and pass it to /etc/sysctl.conf
Code:
kernel.sem = 4096    4096    32      128

I tried like

Code:
 
echo "kernel.sem ="|cat /proc/sys/kernel/sem >> /etc/sysctl.conf
print ""kernel.sem ="|cat /proc/sys/kernel/sem >> /etc/sysctl.conf

but getting error

I know awk will work, but I want to append the string by cat command.

is there any option in unix. I want run it in command prompt.
# 2  
Old 04-17-2015
Don't pipe the echo, connect the two by either ANDing them:
Code:
echo -n "kernel.sem =  " && cat /proc/sys/kernel/sem

or a group command (compound command):
Code:
{ echo -n "kernel.sem =  "; cat /proc/sys/kernel/sem; }

This User Gave Thanks to RudiC For This Post:
stew
# 3  
Old 04-17-2015
Thank you Smilie
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Cat files listed in text file and redirect to new directory with same filename

I have a directory that is restricted and I cannot just copy the files need, but I can cat them and redirect them to a new directory. The files all have the date listed in them. If I perform a long listing and grep for the date (150620) I can redirect that output to a text file. Now I need to... (5 Replies)
Discussion started by: trigger467
5 Replies

2. Shell Programming and Scripting

Redirect the output of the file based on String

Hi, I need to redirect the output of the file until the first instance of a string is found. So in the filename output.txt i was to redirect everything from the start to where i find this string "BEA-000377" is found to a new file called output_new.txt Sample output.txt the controller... (1 Reply)
Discussion started by: mohtashims
1 Replies

3. Shell Programming and Scripting

Find string in file and append new string after

Hi All, I'm trying to insert a string into a file at a specific location. I'd like to add a string after the parent::__construct(); in my file. <?php if (! defined('BASEPATH')) exit('No direct script access allowed'); class MY_Controller extends CI_Controller { function... (6 Replies)
Discussion started by: jjkilpatrick
6 Replies

4. Shell Programming and Scripting

cat redirect EOF missing text

Hello attempting to redirect out to create a startup script in solaris. The steps are working but the $1 entry is being left out. syntax below and content of output file below. cat > S99build << EOF > #!/bin/bash > case $1 in > 'start') > /usr/os-buildsol.sh > > ;; > esac > exit 0 >... (3 Replies)
Discussion started by: juanb25
3 Replies

5. UNIX for Dummies Questions & Answers

How can i append a file name with a string

Hi All How can i append a file name with a string e.g. Lets say i have a file called ABC_TEST_1234_1.dat and i want to append the file name with a lets say 100 so the output file should look like ABC_100_TEST_1234_1.dat i have aroung 9000 file in a directory and want to... (3 Replies)
Discussion started by: Nikhilindurkar
3 Replies

6. Shell Programming and Scripting

redirect cat to variable

hello just i saw a really strange for cat i have file (file1) contains line /home/rajiv/proj1/*.txt now applied a commonds DDPATH="$(cat file1)" echo $DDPATH it shows all the txt files in that folder like /home/rajiv/proj1/read1.txt /home/rajiv/proj1/read2.txt... (7 Replies)
Discussion started by: shailesh_arya
7 Replies

7. Shell Programming and Scripting

Append (cat) to beginning of file ?

Hi, Fairly new to unix scripting, hoping to get some help. using AIX v5 Basically I have 3 files 1). Header record 2). many detail record 3). Trailer record My desired result is 1 file which contains Heaeder, Detail, Trailer Currenty I am using a series of: ... (8 Replies)
Discussion started by: CBZ
8 Replies

8. UNIX for Dummies Questions & Answers

How to redirect date with string command into txt file

Hello im trying to redirect the standard output into txt file but with combination of string if I do : date >! foo.txt there is no problem and im getting the date into the foo.txt but what should I do if I like to add string in the same command so the result will be in the txt : The date... (2 Replies)
Discussion started by: umen
2 Replies

9. Shell Programming and Scripting

variable= 'cat file|wc -l' String problems

Hi, does anybody knows about wc -l, how to transform it inot a just number? this script ALWAYS executes the command3!!, However, the value of BMU_RUNNING is 1 case $BMU_RUNNING in *0) command1 ;; *1) command 2;; *)command 3;; esac The... (3 Replies)
Discussion started by: Santiago
3 Replies

10. UNIX for Dummies Questions & Answers

Append and redirect

Can somebody please explain to me what redirection (>) and append are? What is the difference between > and >>? Thank-you (1 Reply)
Discussion started by: Anna
1 Replies
Login or Register to Ask a Question