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Top Forums Shell Programming and Scripting Need help improving my script. Post 302970884 by bakunin on Wednesday 13th of April 2016 05:29:43 AM
Old 04-13-2016
Quote:
Originally Posted by garlandxj11
What is the difference in "+" instead of "\;" ? What about that would help with the speed? Sorry for my ignorance. I really am trying to learn as I go on this. Smilie
First off: no problem! There no dumb questions, just dumb answers, so don't be shy.

The difference is that "\;" will call the command named in "-exec" each time a file is found. For instance, let us suppose in the curent directory are 5 files, "a", "b", "c", "d" and "e" (and nothing else):

Code:
find . -type f -exec rm {} \;

This wil delete all the files, but it will delete every file individually. In fact this will be executed:

Code:
rm a
rm b
rm c
rm d
rm e

But "rm" can take a list of files as well and this:

Code:
find . -type f -exec rm {} +

would be the same as

Code:
rm a b c d e

The difference seems to be small, but the most time, when calling a command like "rm", is the loading and starting of the program, not its execution. Therefore, if the command is executed only every fifth time the speed gain will be quite noticeably.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

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cfspeed(3C)															       cfspeed(3C)

NAME
cfgetospeed(), cfsetospeed(), cfgetispeed(), cfsetispeed() - tty baud rate functions SYNOPSIS
DESCRIPTION
These functions set and get the input and output speed codes in the termios structure referenced by termios_p. The termios structure con- tains these speed codes representing input and output baud rates as well as other terminal related parameters. Setting the parameters on a terminal file does not become effective until is successfully called. returns the output speed code from the termios structure referenced by termios_p. sets the output speed code in the termios structure referenced by termios_p to speed. The speed code for a baud rate of zero, is used to termi- nate the connection. If is specified, the modem control lines are no longer asserted, which normally discon- nects the line. returns the input speed code from the termios structure referenced by termios_p. sets the input speed code in the termios structure referenced by termios_p to speed. RETURN VALUE
returns the output speed code from the termios structure referenced by termios_p. returns the input speed code from the termios structure referenced by termios_p. and return zero upon successful completion. Otherwise, they return -1 and set to indicate the error. ERRORS
and fail when the following condition is encountered: [EINVAL] The value of speed is outside the range of possible speed codes as specified in WARNINGS
and can be used to set speed codes in the termios structure that are not supported by the terminal hardware. SEE ALSO
tcattribute(3C), thread_safety(5), termio(7). STANDARDS CONFORMANCE
cfspeed(3C)
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