Unix Tutorial

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Address Substitution: ............................................................................. 119 The Matching Command: ....................................................................... 120 Using Regular Expression: ..................................................................... 120 Matching Characters: ............................................................................. 121 Character Class Keywords: .................................................................... 122 Aampersand Referencing: ...................................................................... 122 Using Multiple sed Commands: .............................................................. 123 Back References: ................................................................................... 123 Unix – File System Basics .................................................... 125 Directory Structure: ................................................................................ 125 Navigating the File System: .................................................................... 126 The df Command: .................................................................................. 127 The du Command: ................................................................................. 127 Mounting the File System: ...................................................................... 128 Unmounting the File System: ................................................................. 128 User and Group Quotas: ........................................................................ 128 Unix – User Administration ................................................... 130 Managing Users and Groups: ................................................................ 130 Create a Group ...................................................................................... 131 Modify a Group: ...................................................................................... 131 Delete a Group: ...................................................................................... 131 Create an Account ................................................................................. 132 Modify an Account: ................................................................................. 132 Delete an Account: ................................................................................. 133 Unix – System Performance ................................................ 134 Peformance Components: ...................................................................... 134 Peformance Tools: ................................................................................. 135 Unix – System Logging ........................................................ 136 Syslog Facilities: .................................................................................... 136 Syslog Priorities: .................................................................................... 137 The /etc/syslog.conf file: ......................................................................... 138 Logging Actions: ..................................................................................... 138 The logger Command:............................................................................ 139 Log Rotation: .......................................................................................... 139 Important Log Locations ......................................................................... 139 Unix – Signals and Traps ..................................................... 140 List of Signals: ........................................................................................ 140 Default Actions: ...................................................................................... 141 Sending Signals: .................................................................................... 141 TUTORIALS POINT Simply Easy Learning
Trapping Signals: ................................................................................... 141 Cleaning Up Temporary Files: ................................................................ 142 Ignoring Signals: .................................................................................... 142 Resetting Traps: ..................................................................................... 143 Unix – Useful Commands .................................................... 144 Files and Directories:.............................................................................. 144 Manipulating data: .................................................................................. 145 Compressed Files: ................................................................................. 146 Getting Information: ................................................................................ 146 Network Communication: ....................................................................... 147 Messages between Users: ..................................................................... 147 Programming Utilities: ............................................................................ 147 Misc Commands: ................................................................................... 149 Unix – Builtin Functions ........................................................ 151 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: Example: ..........................
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
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POSIX shell ( sh) The different C-t
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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
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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
Page 149 and 150:
Command Dbx Gdb Make Nm Size Strip
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Reset Reset terminal mode Script Ke
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