Unix Tutorial

Recommendations

Info

NAME SYNOPSIS DESCRIPTION OPTIONS SEE ALSO BUGS EXAMPLES AUTHORS Name of the command General usage parameters of the command. Generally describes of the command and what it does Describes all the arguments or options to the command Lists other commands that are directly related to the command in the man page or closely resembling its functionality. Explains any known issues or bugs that exist with the command or its output Common usage examples that give the reader an idea of how the command can be used. The author of the man page/command. So finally, I would say that man pages are a vital resource and the first avenue of research when you need information about commands or files in a Unix system. Useful Shell Commands: Now you know how to proceed, following link would give you a list of most important and very frequently used Unix Shell commands. If you do not know how to use any command then use man page to get complete detail about the command. Here is the list of Unix Shell - Useful Commands TUTORIALS POINT Simply Easy Learning
CHAPTER 24 Unix - Regular Expressions Aregular expression is a string that can be used to describe several sequences of characters. Regular expressions are used by several different Unix commands, including ed, sed, awk, grep, and, to a more limited extent, vi. This tutorial would teach you how to use regular expression along with sed. Here sed stands for stream editor is a stream oriented editor which was created exclusively for executing scripts. Thus all the input you feed into it passes through and goes to STDOUT and it does not change the input file. Invoking sed: Before we start, let us take make sure you have a local copy of /etc/passwd text file to work with sed. As mentioned previously, sed can be invoked by sending data through a pipe to it as follows: $ cat /etc/passwd | sed Usage: sed [OPTION]... {script-other-script} [input-file]... -n, --quiet, --silent suppress automatic printing of pattern space -e script, --expression=script ............................... The cat command dumps the contents of /etc/passwd to sed through the pipe into sed's pattern space. The pattern space is the internal work buffer that sed uses to do its work. The sed General Syntax: Following is the general syntax for sed /pattern/action Here, pattern is a regular expression, and action is one of the commands given in the following table. If pattern is omitted, action is performed for every line as we have seen above. The slash characters ( /) that surround the pattern are required because they are used as delimiters. Range p Description Prints the line TUTORIALS POINT Simply Easy Learning
Page 1 and 2:
Unix Tutorial
Page 3 and 4:
ABOUT THE TUTORIAL Unix Tutorial UN
Page 5 and 6:
Renaming Directories: .............
Page 7 and 8:
Extended Shell Scripts: ...........
Page 9 and 10:
Example: ..........................
Page 11 and 12:
Trapping Signals: .................
Page 13 and 14:
The main concept that unites all ve
Page 15 and 16:
New UNIX password:******* Retype ne
Page 17 and 18:
CHAPTER 2 Unix File Management All
Page 19 and 20:
Displays all the files whose name s
Page 21 and 22:
4. Fourth Column: represents file n
Page 23 and 24:
CHAPTER 3 Unix Directories Adirecto
Page 25 and 26:
Creates the directories docs and pu
Page 27 and 28:
CHAPTER 4 Unix File Permission Setu
Page 29 and 30:
$ls -l testfile -rw-rwxrwx 1 amrood
Page 31 and 32:
The SUID and SGID bits will appear
Page 33 and 34:
Note - The shell initialization pro
Page 35 and 36:
The default secondary prompt is > (
Page 37 and 38:
CHAPTER 6 Java Basic Utilities So f
Page 39 and 40:
laserp-574 grace 82744 Nov 7 11:28
Page 41 and 42:
CHAPTER 7 Unix Pipes and Filters Yo
Page 43 and 44:
This pipe sorts all files in your d
Page 45 and 46:
The process runs in the foreground,
Page 47 and 48:
$kill -9 6738 Terminated Parent and
Page 49 and 50:
CHAPTER 9 Unix Communication When y
Page 51 and 52:
prompt on Turns prompt on. Dir List
Page 53 and 54:
No Plan. Check all the logged in us
Page 55 and 56:
~ ~ ~ ~ ~ ~ ~ ~ "testfile" [New Fil
Page 57 and 58:
Command CTRL+d CTRL+d CTRL+f CTRL+u
Page 59 and 60:
^G U U J Press CNTRL and G keys at
Page 61 and 62:
IMPORTANT: Here are the key points
Page 63 and 64:
POSIX shell ( sh) The different C-t
Page 65 and 66: CHAPTER 12 Unix- Using Variables Av
Page 67 and 68: NAME="Zara Ali" unset NAME echo $NA
Page 69 and 70: Command-Line Arguments: The command
Page 71 and 72: CHAPTER 14 Unix - Using Arrays Ashe
Page 73 and 74: CHAPTER 15 Unix - Basic Operators T
Page 75 and 76: val=`expr $b / $a` echo "b / a : $v
Page 77 and 78: else echo "$a -ge $b: a is not grea
Page 79 and 80: != Checks if the value of two opera
Page 81 and 82: ] is true. -x file Check if file is
Page 83 and 84: Right shift == String comparison fo
Page 85 and 86: -r file Checks if file is readable
Page 87 and 88: Example: #!/bin/sh a=10 b=20 if [ $
Page 89 and 90: There is only one form of case...es
Page 91 and 92: CHAPTER 17 Unix - Shell Loops Loops
Page 93 and 94: done This will produce following re
Page 95 and 96: 4) juice 5) appe 6) all 7) none #?
Page 97 and 98: CHAPTER 18 Unix - Loop Control So f
Page 99 and 100: 1 0 1 5 The continue statement: The
Page 101 and 102: \n new line \r carriage return \t h
Page 103 and 104: CHAPTER 20 Unix - Quoting Mechanism
Page 105 and 106: The Double Quotes: Try to execute t
Page 107 and 108: CHAPTER 21 Unix - IO Redirections M
Page 109 and 110: EOF 3 $ This is a simple lookup pro
Page 111 and 112: CHAPTER 22 Unix - Shell Functions F
Page 113 and 114: echo "Return value is $ret" This wo
Page 115: CHAPTER 23 Unix - Manpage Help All
Page 119 and 120: Try out the following address range
Page 121 and 122: sys:x:3:3:sys:/dev:/bin/sh sync:x:4
Page 123 and 124: [0-9] Matches a single number [a-zA
Page 125 and 126: (555)555-1213 (555)555-1214 (666)55
Page 127 and 128: dev /etc /lib /boot /home /mnt /pro
Page 129 and 130: $du -h /etc 5k /etc/cron.d 63k /etc
Page 131 and 132: CHAPTER 26 Unix - User Administrati
Page 133 and 134: $ groupdel developer This removes o
Page 135 and 136: CHAPTER 27 Unix - System Performanc
Page 137 and 138: CHAPTER 28 Unix - System Logging Un
Page 139 and 140: The combination of facilities and l
Page 141 and 142: Unix - Signals and Traps CHAPTER 29
Page 143 and 144: Trapping these signals is quite eas
Page 145 and 146: CHAPTER 30 Unix - Useful Commands T
Page 147 and 148: Ispell Emacs ex, edit Emacs Emacs C
Page 149 and 150: Command Dbx Gdb Make Nm Size Strip
Page 151 and 152: Reset Reset terminal mode Script Ke
show all

Unix Tutorial

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?