Chapter 9 Basic File Processing Objectives

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Chapter 9 Basic File Processing

Objectives • To discuss how to display contents of a file • To explain copying, appending, moving/ renaming, and removing/ deleting files. • To describe how to determine the size of a file • To discuss commands for comparing files • To describe how to combine files • To discuss printer control commands • To cover the commands and primitives – > , >> , ^, ~, [ ], *, ? , cancel, cat … Copyright © 2005 Pearson Addison-Wesley. All rights reserved.

Viewing Contents of Text Files • Viewing Complete Files – cat [options][file-list] • Viewing files One Page at a Time – more [options][file-list] Copyright © 2005 Pearson Addison-Wesley. All rights reserved.

Viewing Contents of Text Files (Contd) • Viewing the Head or Tail of a

Copying, Moving and Removing Files • Copying Files – cp [options] file 1 file

Copying, Moving and Removing Files (Contd) • Moving Files – mv [options] file 1

Copying, Moving and Removing Files (Contd) • Removing/ Deleting Files – rm [options] file-list

Copying, Moving and Removing Files (Contd) • Determining File Size – ls –l –

Appending to Files and Comparing Files cat [file-list] >> destination-file diff [options][file 1][file 2]

Comparing Files Copyright © 2005 Pearson Addison-Wesley. All rights reserved.

Removing Repeated Lines uniq [options][+N][input-file][output-file] $ cat sample This is a test file for the uniq command. It contains some repeated and some nonrepeated lines. Some of the repeated lines are consecutive, like this. And, some are not consecutive, like the following. Some of the repeated lines are consecutive, like this. The above line, therefore, will not be considered a repeated line by the uniq command, but this will be considered repeated! $ uniq sample This is a test file for the uniq command. It contains some repeated and some nonrepeated lines. Some of the repeated lines are consecutive, like this. And, some are not consecutive, like the following. Some of the repeated lines are consecutive, like this. The above line, therefore, will not be considered a repeated line by the uniq command, but this will be considered repeated! $ Copyright © 2005 Pearson Addison-Wesley. All rights reserved.

Removing Repeated Lines uniq [options][+N][input-file][output-file] $ uniq -c sample 1 This is a test file for the uniq command. 1 It contains some repeated and some nonrepeated lines. 3 Some of the repeated lines are consecutive, like this. 1 And, some are not consecutive, like the following. 1 Some of the repeated lines are consecutive, like this. 1 The above line, therefore, will not be considered a repeated 2 line by the uniq command, but this will be considered repeated! $ uniq -d sample Some of the repeated lines are consecutive, like this. line by the uniq command, but this will be considered repeated! $ uniq -d sample out $ cat out Some of the repeated lines are consecutive, like this. line by the uniq command, but this will be considered repeated! $ Copyright © 2005 Pearson Addison-Wesley. All rights reserved.

Printing Files Copyright © 2005 Pearson Addison-Wesley. All rights reserved.

Printing Files and Controlling Print Jobs • Printing Files lp [options] file-list lpr [options]

Printing Files and Controlling Print Jobs (Contd) – lpq [options] Copyright © 2005 Pearson

Printing Files and Controlling Print Jobs (Contd) • Canceling Your Print Job – cancel

Printing Files and Controlling Print Jobs (Contd) • Canceling Your Print Job (Contd) –

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