Linux in a Nutshell, Fifth Edition

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Chapter 3: Linux Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

Options

-a, --time=atime, --time=access, --time=use

Update only the access time.

-c, --no-create

Do not create any file that doesn’t already exist.

-d time, --date time

Change the time value to the specified time instead of the

current time. time can use several formats and may contain

month names, time zones, a.m. and p.m. strings, etc.

-m, --time=mtime, --time=modify

Update only the modification time.

-r file, --reference file

Change times to be the same as those of the specified file,

instead of the current time.

-t time

Use the time specified in time instead of the current time. This

argument must be of the format [[cc]yy]mmddhhmm[.ss], indi-

cating optional century and year, month, date, hours, minutes,

and optional seconds.

--help

Print help message and then exit.

--version

Print the version number and then exit.

tr

tr [options] [string1 [string2]]

Translate characters. Copy standard input to standard output,

substituting characters from string1 to string2, or deleting charac-

ters in string1.

Options

-c, --complement

Complement characters in string1 with respect to ASCII

001–377.

-d, --delete

Delete characters in string1 from output.

-s, --squeeze-repeats

Squeeze out repeated output characters in string2.

-t, --truncate-set1

Truncate string1 to the length of string2 before ...