UnixCh345.txt

Command Mode, Text Entry Mode and Status Line Mode

Unstructured ASCII character, Structured ASCII records, Structured ASCII trees.

Flat ASCII files

Standard In (stdin)

Standard Out (stdout)

updates a file's time and date stamps & creates empty files

removes empty directories

extracts specific columns or fields from a file

combines two or more files

sorts a file's contents

locates files based on a search criteria

extracts data from two files sharing a common field and uses this field to join the two files

is a pattern-scanning and processing language useful for creating a formatted report with a professional look

compares sorted files and shows differences

compares and selects the differences in two files

grep (Global Regular Expression Print) selects lines or rows

selects lines from the beginning of a file

selects lines from the end of a file

selects unique lines or row

concatenates files, it also shows files in the stdout/ monitor

changes the security mode of a file or directory

formats and prints

edits data streams or file editor designed to make global changes to large files

translates and deletes character by character

(.) period

u

append below

append above

open below

open above

overstrike/overwrite

Delete lines -- saves them into buffer -- copy

paste below

Paste above

delete individual character

yank - copy

status line

Quit w/o saving

save and quit

save as

save and exit w/o prompting

error output to screen/monitor

search forward for a pattern of characters

delete the word starting at the cursor. if the cursor is in the middle of the word, delete from the cursor to the end of the word

delete from the cursor to the end of the line

delete from the cursor to the start of the line

the command to execute, comments to identify and explain the script so that other users can understand how it works

it's used to mark a comment

"sh" followed by the name of the script or make the script executable and type "./" prior to the script name