Unix Tutorial

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Background Processes: ........................................................................... 44 Listing Running Processes: ...................................................................... 44 Stopping Processes: ................................................................................ 45 Parent and Child Processes: .................................................................... 46 Zombie and Orphan Processes: ............................................................... 46 Daemon Processes: ................................................................................. 46 The top Command: .................................................................................. 46 Job ID Versus Process ID: ....................................................................... 46 Unix Communication .............................................................. 48 The ping Utility: ........................................................................................ 48 Syntax: ..................................................................................................... 48 Example: .................................................................................................. 48 The ftp Utility: ........................................................................................... 49 Syntax: ..................................................................................................... 49 Example: .................................................................................................. 50 The telnet Utility: ...................................................................................... 51 The finger Utility: ...................................................................................... 51 Unix – The vi Editor ................................................................ 53 Starting the vi Editor: ................................................................................ 53 Operation Modes: ..................................................................................... 54 Getting Out of vi: ...................................................................................... 54 Moving within a File: ................................................................................. 54 Control Commands: ................................................................................. 55 Editing Files: ............................................................................................. 56 Deleting Characters: ................................................................................ 56 Change Commands: ................................................................................ 57 Copy and Past Commands: ..................................................................... 57 Advanced Commands: ............................................................................. 57 Word and Character Searching: ............................................................... 58 Set Commands: ....................................................................................... 59 Running Commands:................................................................................ 59 Replacing Text: ........................................................................................ 59 IMPORTANT: ........................................................................................... 60 Unix- What is Shell ................................................................. 61 Shell Prompt: ............................................................................................ 61 Shell Types: ............................................................................................. 61 Shell Scripts: ............................................................................................ 62 Example Script: ........................................................................................ 62 Shell Comments: ...................................................................................... 62 TUTORIALS POINT Simply Easy Learning
Extended Shell Scripts: ............................................................................ 63 Unix- Using Variables............................................................. 64 Variable Names: ....................................................................................... 64 Defining Variables: ................................................................................... 64 Accessing Values: .................................................................................... 65 Read-only Variables: ................................................................................ 65 Unsetting Variables: ................................................................................. 65 Variable Types: ........................................................................................ 66 Unix-Special Variables ........................................................... 67 Command-Line Arguments: ..................................................................... 68 Special Parameters $* and $@: ............................................................... 68 Exit Status: ............................................................................................... 69 Unix – Using Arrays ............................................................... 70 Defining Array Values:.............................................................................. 70 Accessing Array Values: .......................................................................... 71 Unix - Basic Operators .......................................................... 72 Arithmetic Operators: ............................................................................... 73 Relational Operators: ............................................................................... 74 Boolean Operators: .................................................................................. 76 Example: .................................................................................................. 76 String Operators: ...................................................................................... 77 Example: .................................................................................................. 78 File Test Operators: ................................................................................. 79 Example: .................................................................................................. 80 C Shell Operators: .................................................................................... 81 Arithmatic and Logical Operators: ............................................................ 81 File Test Operators: ................................................................................. 82 Korn Shell Operators: ............................................................................... 83 Arithmatic and Logical Operators: ............................................................ 83 File Test Operators: ................................................................................. 83 Unix – Decision Making .......................................................... 85 The if...else statements: ........................................................................... 85 if...fi statement .......................................................................................... 85 Syntax: ..................................................................................................... 85 Example: .................................................................................................. 86 if...else...fi statement ................................................................................ 86 Syntax: ..................................................................................................... 86 Example: .................................................................................................. 86 if...elif...else...fi statement ......................................................................... 87 TUTORIALS POINT Simply Easy Learning
Page 1 and 2: Unix Tutorial
Page 3 and 4: ABOUT THE TUTORIAL Unix Tutorial UN
Page 5: Renaming Directories: .............
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
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^G U U J Press CNTRL and G keys at
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IMPORTANT: Here are the key points
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POSIX shell ( sh) The different C-t
Page 65 and 66:
CHAPTER 12 Unix- Using Variables Av
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NAME="Zara Ali" unset NAME echo $NA
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Command-Line Arguments: The command
Page 71 and 72:
CHAPTER 14 Unix - Using Arrays Ashe
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CHAPTER 15 Unix - Basic Operators T
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val=`expr $b / $a` echo "b / a : $v
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else echo "$a -ge $b: a is not grea
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!= Checks if the value of two opera
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] is true. -x file Check if file is
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Right shift == String comparison fo
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-r file Checks if file is readable
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Example: #!/bin/sh a=10 b=20 if [ $
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There is only one form of case...es
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CHAPTER 17 Unix - Shell Loops Loops
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done This will produce following re
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4) juice 5) appe 6) all 7) none #?
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CHAPTER 18 Unix - Loop Control So f
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1 0 1 5 The continue statement: The
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\n new line \r carriage return \t h
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CHAPTER 20 Unix - Quoting Mechanism
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The Double Quotes: Try to execute t
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CHAPTER 21 Unix - IO Redirections M
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EOF 3 $ This is a simple lookup pro
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CHAPTER 22 Unix - Shell Functions F
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echo "Return value is $ret" This wo
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CHAPTER 23 Unix - Manpage Help All
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CHAPTER 24 Unix - Regular Expressio
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Try out the following address range
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sys:x:3:3:sys:/dev:/bin/sh sync:x:4
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[0-9] Matches a single number [a-zA
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(555)555-1213 (555)555-1214 (666)55
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dev /etc /lib /boot /home /mnt /pro
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$du -h /etc 5k /etc/cron.d 63k /etc
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CHAPTER 26 Unix - User Administrati
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$ groupdel developer This removes o
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CHAPTER 27 Unix - System Performanc
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CHAPTER 28 Unix - System Logging Un
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The combination of facilities and l
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Unix - Signals and Traps CHAPTER 29
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Trapping these signals is quite eas
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CHAPTER 30 Unix - Useful Commands T
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Ispell Emacs ex, edit Emacs Emacs C
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Command Dbx Gdb Make Nm Size Strip
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Reset Reset terminal mode Script Ke
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