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Full Discussion: How to append a string by cat and redirect to other file?
Top Forums UNIX for Dummies Questions & Answers How to append a string by cat and redirect to other file? Post 302941538 by stew on Friday 17th of April 2015 04:49:40 AM
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.
 

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LEARN ABOUT LINUX

sysctl

SYSCTL(8)																 SYSCTL(8)

NAME

       sysctl - configure kernel parameters at runtime

SYNOPSIS

       sysctl [-n] [-e] variable ...
       sysctl [-n] [-e] [-q] -w variable=value ...
       sysctl [-n] [-e] [-q] -p [filename]
       sysctl [-n] [-e] -a
       sysctl [-n] [-e] -A

DESCRIPTION

       sysctl is used to modify kernel parameters at runtime.  The parameters available are those listed under /proc/sys/.  Procfs is required for
       sysctl support in Linux.  You can use sysctl to both read and write sysctl data.

PARAMETERS

       variable
	      The name of a key to read from.  An example is kernel.ostype.  The '/' separator is also accepted in place of a '.'.

       variable=value
	      To set a key, use the form variable=value where variable is the key and value is the value to set it  to.   If  the  value  contains
	      quotes or characters which are parsed by the shell, you may need to enclose the value in double quotes.  This requires the -w param-
	      eter to use.

       -n     Use this option to disable printing of the key name when printing values.

       -e     Use this option to ignore errors about unknown keys.

       -N     Use this option to only print the names. It may be useful with shells that have programmable completion.

       -q     Use this option to not display the values set to stdout.

       -w     Use this option when you want to change a sysctl setting.

       -p     Load in sysctl settings from the file specified or /etc/sysctl.conf if none given.  Specifying - as filename means reading data from
	      standard input.

       -a     Display all values currently available.

       -A     Display all values currently available in table form.

EXAMPLES

       /sbin/sysctl -a
       /sbin/sysctl -n kernel.hostname
       /sbin/sysctl -w kernel.domainname="example.com"
       /sbin/sysctl -p /etc/sysctl.conf

FILES

       /proc/sys
       /etc/sysctl.conf

SEE ALSO

       sysctl.conf(5)

BUGS

       The -A parameter behaves just as -a does.

AUTHOR

       George Staikos, <staikos@0wned.org>

								    21 Sep 1999 							 SYSCTL(8)
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