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Sams Teach Yourself Shell Programming in 24 Hours Contents Index A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Symbols J job controls determining if available to shell, 1st jobs kill command, 1st jobs command, 1st, 2nd Joy, Bill, 1st Sams Teach Yourself Shell Programming in 24 Hours Contents Index A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Symbols © Copyright Macmillan Computer Publishing. All rights reserved.
Sams Teach Yourself Shell Programming in 24 Hours Contents Index A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Symbols K kernel, 1st accessing features with system calls, 1st kill command, 1st, 2nd -l option, 1st signals, 1st kill signals, 1st, 2nd Korn shell array variables, 1st integer expressions, 1st, 2nd, 3rd parameter substitution, 1st, 2nd starting C Shell from, 1st support arrays, 1st wildcards, 1st Korn shell. See ksh, 1st Korn, David, 1st ksh, 1st, 2nd exporting variables, 1st ksh shell until loop, 1st Sams Teach Yourself Shell Programming in 24 Hours Contents Index A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Symbols © Copyright Macmillan Computer Publishing. All rights reserved.
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Sams Teach Yourself Shell Programmi
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● Using Single Quotes ● Using D
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● Questions Hour 20: Debugging
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● Part I is an introduction to UN
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Many of the examples and the answer
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$ date [ENTER] Wed Dec 9 08:49:13 P
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anga pts/0 Dec 9 08:49 $ Here, the
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The original UNIX shell was written
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There are three major versions of k
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example, when you execute the comma
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This executes the compound command
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chmod a+x ./logins Here you are usi
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Try using the man command to get mo
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Hidden Files So far you have used l
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© Copyright Macmillan Computer Pub
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Numbering Lines The cat command als
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command $ wc -w .rhosts produces th
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produces the following error: cp: w
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m: work directory The two files are
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name. Thus both of the following fi
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../docs/ch5.doc represents the file
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changes to the directory /usr/local
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If you specify several arguments in
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Sometimes when you want to create a
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$ cp -r docs /mnt/zip/backup cp: ca
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Removing Directories You can use tw
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$ ls -ld /home/ranga This produces
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You can see the relative path by us
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Sections in this Chapter: File Type
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The permission block for this file
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Here, expression is a statement of
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For example, if the directory pub c
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Restrictions The super user, root,
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Running the same ls command as in t
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Tip - Background Processes That Wri
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the fg command. By default, the pro
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dhorvath 6770 3662 2 10:35:45 pts/6
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By default, a process runs with the
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Process Identifier --The process id
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Variable Names The name of a variab
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Array Variables The Bourne shell, s
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$ band[2]=mike $ band[3]=gene Tip -
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Hour 7: Variables Sections in this
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uses internally. Users can modify t
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Here, command is the name of a comm
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$ ls ch??.doc to accomplish this. M
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is unset. Assigning a Default Value
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It now gives this error result: Hel
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Sections in this Chapter: Quoting w
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To the shell, one or more spaces or
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Quoting Regular Expression Wildcard
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fi list5 Both the elif and the else
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Here you have an elif statement tha
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Consider the following if statement
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If you were to use the - n option i
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else echo "An error was encountered
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1. First the test [ -z "$DTHOME" ]
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esac Here the string contained in $
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The execution of a while loop proce
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5 4 3 2 1 0 6 5 4 3 2 1 0 7 6 5 4 3
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2. If the exit status of command is
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for i in 0 1 2 3 4 5 6 7 8 9 do ech
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3. When the user enters a value, $R
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The continue Command The continue c
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If you want to list the contents of
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In this version, the basename comma
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USAGE="Usage: ´basename $0´ [-c|-
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uuencoding a file. For readers who
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fi fi echo $MSG You could simplify
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● Formatting escape sequences Emb
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Name User Name Sriranga ranga Sriva
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Table 13.2 Formatting Sequence Type
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printf "%-32s " "$i" if [ -d "$i" ]
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anga ttyp0 Oct 27 19:42 (:0.0) amma
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Say you need to send a list of phon
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"Miscellaneous Tools," I will show
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$ exec 4>fd4.out associates the fil
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command > file 2>&1 list > file 2>&
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when the while loop exits, the valu
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Note - The shell uses the value of
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This function has three important p
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} OLDIFS="$IFS" IFS=: # print each
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} # set the directory to pop to the
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index.html RCS humor misc downloads
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unix has several additional pieces
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pqops.c:/* Function to delete a nod
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Here I specified set2 as the space
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$ tr '!?":;\[\]{}(),.\t\n' ' ' < /h
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in 69 ' 65 the 389 to 164 of 127 No
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tr '[:classname:]' 'set2' Here clas
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single letters, whereas in awk the
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able was I, ere I saw elba Because
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By adding the ^ metacharacter as fo
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\$[0-9]*\.[0-9][0-9]\/[a-zA-Z]*/ If
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Here you list the name of a fruit a
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$ rm fruit_prices.txt.$$ Performing
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Fortunately, the s command provides
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lrwxrwxrwx 1 ranga users 8 Nov 27 1
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The original awk has remained almos
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Kiwi 22 Pineapple 35 Apple 78 All t
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Pineapple $1.29 35 REORDER Apple $0
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$ ls -l produces output formatted s
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The value that you assign a variabl
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x=x+1 In awk this can be written in
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the pattern specifies. To solve you
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awk -F: '{ ... }' The major differe
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identical to expressions you looked
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The basic syntax is do { actions }
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B:amount Here amount is the balance
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The OUTPUT variable contains the >
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: ${LINES:=24} ${TERM:?"TERM not se
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Sections in this Chapter: The eval
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eports/1998 The starting directory.
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find: -type Option The -type option
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find / -name alpha -size +50 -mtime
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18 quit $ obase=16 sets the output
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The default action for the signals
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fi Init() { printf "INFO: Initializ
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4. Wait for the program to finish e
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} if [ $? -eq 0 ] ; then echo "Sub-
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A third way of enabling debugging i
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Here the debugging mode is enabled
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if [ $YN = "y" ] ; then Making this
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$ /bin/sh -nv ./buggy2.sh the outpu
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Deleting old backups, please wait..
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If you do not type a response and p
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To deactivate debugging, use either
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3 MSG="hello" 4 echo_error $MSG Her
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echo "ERROR: File $MYFILE was not f
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previous call to this function. Aft
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} Before you look at some examples
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dev/hda1 1190014 664661 463867 59%
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The number returned is in kilobytes
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getUID() { id $1 | sed -e 's/(.*$//
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63 printf "$1 (y/n)? " 64 65 if [ -
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}' 171 # Args: $1 -> the command na
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Some UNIX versions implement a work
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24 printERROR "The source $1 is not
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easily modify the script to replace
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Hour 22: Problem Solving with Shell
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To maintain your address book, you
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produces two matches: Name: Srirang
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26 # enable erasing input 27 28 stt
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2. Based on user feedback, delete t
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73 promptYESNO "Delete this entry"
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MYADDRESSBOOK="$HOME/addressbook" i
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Here, options is one or more of the
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Now that you have looked at using t
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Abstraction is a technique used to
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warning: '-' deprecated; use 'ps au
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produce the same result if the curr
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The structure of the UNIX directory
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OLDPREFIX=aaa NEWPREFIX=bbb for FIL
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history (Korn/Bash) shows the most
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Sections in this Chapter: Reserved
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^ bitwise exclusive OR operation |
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Bash array initialization USERVAR=(
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order to fix problems. default beha
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minor number UNIX uses this to asso
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important parameters. This is usual
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Sections in this Chapter: Chapter 1
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USAGE="Usage: ´basename $0´ [-v]
Page 503 and 504: Sams Teach Yourself Shell Programmi
Page 511 and 512: Appendix C: Quiz Answers Sections i
Page 513 and 514: awk -F: ' $1 == "B" { BAL=$NF ; nex
Page 517 and 518: } if [ $DEF_TOUT -ne 0 ] ; then sle
Page 519 and 520: Sections in this Chapter: Chapter 1
Page 521 and 522: } fi if [ ! -d "$1" ] ; then printE
Page 529 and 530: numeric variables, 1st pattern-spec
Page 531 and 532: wildcards, 1st Bourne shells. See s
Page 533 and 534: (colon), 1st character, 1st, 2nd, 3
Page 535 and 536: grep, 1st, 2nd line numbers, 1st li
Page 537 and 538: stty addperson script, 1st tail, 1s
Page 541 and 542: emoving temporary files, 1st displa
Page 543 and 544: mv command, 1st, 2nd rmdir command,
Page 545 and 546: interactive mode, 1st multiple inpu
Page 547 and 548: starting directory, 1st, 2nd findin
Page 553: installation scripts disk usage, 1s
Page 557 and 558: eak command, 1st, 2nd, 3rd continue
Page 559 and 560: mvdir.sh, 1st, 2nd, 3rd, 4th, 5th,
Page 563 and 564: edirection, 1st, 2nd appending to f
Page 565 and 566: [0-9]*, 1st percent sign (%) job nu
Page 567 and 568: profiles shell specific startup wit
Page 573 and 574: hardware type, 1st, 2nd improving,
Page 575 and 576: (standard error), 1st displaying me
Page 589 and 590: prompt, 1st, 2nd, 3rd, 4th quoting
Page 591 and 592: egp command, 1st -k option sort com
Page 593: Index A B C D E F G H I J K L M N O
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