Advanced Bash−Scripting Guide

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Advanced Bash−Scripting Guide read ready # Wait for input, $ready not used. echo; echo "Copying the source CD to $OF." echo "This may take a while. Please be patient." dd if=$CDROM of=$OF bs=$BLOCKSIZE # Raw device copy. echo; echo "Remove data CD." echo "Insert blank CDR." echo "Press ENTER when ready. " read ready # Wait for input, $ready not used. echo "Copying $OF to CDR." cdrecord −v −isosize speed=$SPEED dev=0,0 $OF # Uses Joerg Schilling's "cdrecord" package (see its docs). # http://www.fokus.gmd.de/nthp/employees/schilling/cdrecord.html echo; echo "Done copying $OF to CDR on device $CDROM." echo "Do you want to erase the image file (y/n)? " # Probably a huge file. read answer case "$answer" in [yY]) rm −f $OF echo "$OF erased." ;; *) echo "$OF not erased.";; esac echo # Exercise: # Change the above "case" statement to also accept "yes" and "Yes" as input. exit 0 Example A−7. Collatz series #!/bin/bash # collatz.sh # The notorious "hailstone" or Collatz series. # −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− # 1) Get the integer "seed" from the command line. # 2) NUMBER
Advanced Bash−Scripting Guide #+ an operation that feeds its output back into the input. # Sometimes the result is a "chaotic" series. MAX_ITERATIONS=200 # For large seed numbers (>32000), increase MAX_ITERATIONS. h=${1:−$$} # Seed # Use $PID as seed, #+ if not specified as command−line arg. echo echo "C($h) −−− $MAX_ITERATIONS Iterations" echo for ((i=1; i
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Advanced Bash−Scripting Guide An
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Chapter 1. Why Shell Programming? A
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Chapter 2. Starting Off With a Sha
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Advanced Bash−Scripting Guide Eac
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Chapter 3. Special Characters Speci
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Advanced Bash−Scripting Guide \ /
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Advanced Bash−Scripting Guide * ?
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Advanced Bash−Scripting Guide ASC
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# Sometimes, though, you get: # 11
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The "−" can be used to pipe stdou
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change the behavior of the terminal
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Chapter 4. Introduction to Variable
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Advanced Bash−Scripting Guide Exa
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Advanced Bash−Scripting Guide MIN
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The shift command reassigns the pos
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Example 5−1. Echoing Weird Variab
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(cd /source/directory && tar cf −
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true # the "true" builtin. echo "ex
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Advanced Bash−Scripting Guide Thi
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Advanced Bash−Scripting Guide if
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if [[ −e $file ]] then echo "Pass
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Advanced Bash−Scripting Guide −
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7.3. Comparison operators (binary)
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Example 7−5. arithmetic and strin
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Chapter 8. Operations and Related T
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Advanced Bash−Scripting Guide ! ^
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Advanced Bash−Scripting Guide let
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Part 3. Beyond the Basics Table of
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$EDITOR the default editor invoked
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Advanced Bash−Scripting Guide (Th
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Advanced Bash−Scripting Guide #!/
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Example 9−2. Timed Input Advanced
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Advanced Bash−Scripting Guide fi
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echo 'IFS=":", using "$@"' c=0 for
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Advanced Bash−Scripting Guide #+
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Advanced Bash−Scripting Guide use
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echo '${var1#$pattern1} =' "${var1#
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t=${path_name%/*.*} # Same effect a
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Advanced Bash−Scripting Guide The
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Chapter 10. Loops and Branches Oper
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Advanced Bash−Scripting Guide # T
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Advanced Bash−Scripting Guide OUT
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As is the case with for/in loops, p
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This construct tests for a conditio
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Advanced Bash−Scripting Guide ###
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# Accept upper or lowercase input.
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Advanced Bash−Scripting Guide a=`
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# May need to also press ENTER if a
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Advanced Bash−Scripting Guide let
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Advanced Bash−Scripting Guide Com
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Advanced Bash−Scripting Guide ena
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cat, tac # Burn the CDR. cdrecord
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Advanced Bash−Scripting Guide 12.
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exit $E_CHANGED_MIND ;; *) echo "De
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The multiplication operator must be
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echo Number of digits at the beginn
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Outputs very verbose timing statist
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This line occurs three times. This
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# List all the users in /etc/passwd
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Advanced Bash−Scripting Guide # r
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Advanced Bash−Scripting Guide gre
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The −d option deletes a range of
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# Delete CR and write to new file.
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Advanced Bash−Scripting Guide gzi
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Advanced Bash−Scripting Guide # S
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Advanced Bash−Scripting Guide pre
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Advanced Bash−Scripting Guide che
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Advanced Bash−Scripting Guide No
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mailto Similar to the mail command,
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Advanced Bash−Scripting Guide int
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Advanced Bash−Scripting Guide cas
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Advanced Bash−Scripting Guide Mos
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Advanced Bash−Scripting Guide 2 3
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Advanced Bash−Scripting Guide m4
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Advanced Bash−Scripting Guide pst
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[ ${NETWORKING} = "no" ] && exit 0
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chroot Advanced Bash−Scripting Gu
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Advanced Bash−Scripting Guide bas
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Advanced Bash−Scripting Guide ' c
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Advanced Bash−Scripting Guide Not
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Chapter 15. Arithmetic Expansion Ar
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Advanced Bash−Scripting Guide # T
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# Saves stdin. Advanced Bash−Scri
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Advanced Bash−Scripting Guide 16.
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Chapter 17. Here Documents A here d
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Advanced Bash−Scripting Guide Fil
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Example 17−11. A self−documenti
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Part 4. Advanced Topics At this poi
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Advanced Bash−Scripting Guide lit
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"Sed & Awk", by Dougherty and Robbi
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Chapter 20. Subshells Running a she
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Advanced Bash−Scripting Guide exe
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Advanced Bash−Scripting Guide f1
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# Range: 0 − 200 # It's crude, bu
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Advanced Bash−Scripting Guide alt
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# grep PATTERN /etc/passwd | awk
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Advanced Bash−Scripting Guide # Y
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Chapter 25. List Constructs The "an
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# AND LIST executes on true, OR LIS
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echo ${colors[$index]} let "index =
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# Replace all matching wildcarded s
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Advanced Bash−Scripting Guide Cop
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fi let "t += $i " Primes[t]=$NON_PR
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Advanced Bash−Scripting Guide # =
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# −−−−−−−−− # 1)
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Chapter 28. /dev and /proc A Linux
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Advanced Bash−Scripting Guide net
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Advanced Bash−Scripting Guide # A
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Chapter 30. Debugging The Bash shel
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Page 331 and 332: Chapter 31. Options Options are set
Page 333 and 334: Chapter 32. Gotchas Turandot: Gli e
Page 335 and 336: command1 2> − | command2 # Trying
Page 337 and 338: echo "one two three" | read a b c #
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Page 369 and 370: Bibliography Edited by Peter Dennin
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Page 373 and 374: Mark Komarinski's Printing−Usage
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Page 389 and 390: let "row = $r" # Count center row o
Page 391 and 392: next_gen "$Cur" let "generation +=
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Page 403 and 404: # ListDirectory "FileGlob" "Field
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Page 407 and 408: The md5sum program is documented as
Page 409 and 410: Note: 'mount −l' does return the
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Page 413 and 414: Appendix B. A Sed and Awk Micro−P
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Page 419 and 420: Appendix D. A Detailed Introduction
Page 421 and 422: Appendix E. Localization Localizati
Page 423 and 424: Appendix F. History Commands The Ba
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Advanced Bash−Scripting Guide *)
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Advanced Bash−Scripting Guide com
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Appendix H. Converting DOS Batch Fi
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Advanced Bash−Scripting Guide XCO
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Appendix I. Exercises I.1. Analyzin
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Lottery Numbers One type of lottery
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Advanced Bash−Scripting Guide Usi
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Advanced Bash−Scripting Guide and
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[33] This is actually a script adap
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# Thanks to Stephane Chazelas for p
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