tunsave Command

Purpose

Saves current tunable parameter values to a file.

Syntax

tunsave [ -a | -A ] -f | -F Filename [ -d Description ]

Description

The tunsave command saves the current state of tunable parameters in a file.

If Filename does not already exist, a new file is created. If it already exists, an error message prints unless the -F flag is specified, in which case, the existing file is overwritten.

Note that the saved restricted tunables that have been modified to a value different from the default value, are flagged with a comment # RESTRICTED not at default value, appended to the line.

Flags

Item	Description
-a	Saves all tunable parameters, including those who are currently set to their default value. These parameters are saved with the special value DEFAULT.
-A	Saves all tunable parameters, including those who are currently set to their default value. These parameters are saved numerically, and a comment, # DEFAULT VALUE, is appended to the line to flag them.
-d Description	Specifies the text to use for the Description field. Special characters must be escaped or quoted inside the Description field.
-f Filename	Specifies the name of the tunable file where the tunable parameters are saved. If Filename already exists, an error message prints. If it does not contain the '/' (forward slash) character, the Filename is relative to /etc/tunables.
-F Filename	Specifies the name of the tunable file where the tunable parameters are saved. If Filename already exists, the existing file is overwritten. If it does not contain the '/' (forward slash) character, the Filename is relative to /etc/tunables.

Examples

To save all tunables different from their default value into /etc/tunables/mytunable, enter:
```
tunsave -f mytunable
```
To save all tunables, including those who are currently set to their default value, but replace the default values with the special value DEFAULT, enter:
```
  tunsave -a -f /home/admin/mytunable 
```
To save all tunables, including those who are currently set to their default value using all numerical values, but flag the default values with the comment DEFAULT VALUE, enter:
```
 tunsave -A -f mytunable  
```

Files

Item	Description
/usr/bin/tunsave	Contains the tunsave command.
/etc/tunables	Contains all the saved files.