Advanced Bash−Scripting Guide

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Advanced Bash−Scripting Guide fi return $TRUE # Valid coordinate. } IsAlive () { GetCount "$1" $2 local nhbd=$? # Test whether cell is alive. # Takes array, cell number, state of cell as arguments. # Get alive cell count in neighborhood. if [ "$nhbd" −eq "$BIRTH" ] # Alive in any case. then return $ALIVE fi if [ "$3" = "." −a "$nhbd" −eq "$SURVIVE" ] then # Alive only if previously alive. return $ALIVE fi return $DEAD # Default. } GetCount () { local cell_number=$2 local array local top local center local bottom local r local row local i local t_top local t_cen local t_bot local count=0 local ROW_NHBD=3 # Count live cells in passed cell's neighborhood. # Two arguments needed: # $1) variable holding array # $2) cell number array=( `echo "$1"` ) let "top = $cell_number − $COLS − 1" # Set up cell neighborhood. let "center = $cell_number − 1" let "bottom = $cell_number + $COLS − 1" let "r = $cell_number / $ROWS" for ((i=0; i
let "row = $r" # Count center row of neighborhood. IsValid $t_cen $row # Valid cell position? if [ $? −eq "$TRUE" ] then if [ ${array[$t_cen]} = "$ALIVE1" ] # Is it alive? then # Yes? let "count += 1" # Increment count. fi fi let "row = $r − 1" # Count top row. IsValid $t_top $row if [ $? −eq "$TRUE" ] then if [ ${array[$t_top]} = "$ALIVE1" ] then let "count += 1" fi fi let "row = $r + 1" # Count bottom row. IsValid $t_bot $row if [ $? −eq "$TRUE" ] then if [ ${array[$t_bot]} = "$ALIVE1" ] then let "count += 1" fi fi done Advanced Bash−Scripting Guide if [ ${array[$cell_number]} = "$ALIVE1" ] then let "count −= 1" # Make sure value of tested cell itself fi #+ is not counted. return $count } next_gen () { # Update generation array. local array local i=0 array=( `echo "$1"` ) # Convert passed arg to array. while [ "$i" −lt "$cells" ] do IsAlive "$1" $i ${array[$i]} if [ $? −eq "$ALIVE" ] then array[$i]=. else array[$i]="_" fi let "i += 1" done # Is cell alive? # If alive, then #+ represent the cell as a period. # Otherwise underscore #+ (which will later be converted to space). Appendix A. Contributed Scripts 383
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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 ech
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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 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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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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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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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 No
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mailto Similar to the mail command,
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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 ' 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 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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4. Advanced Bash−Scripting Guide
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Advanced Bash−Scripting Guide whi
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Chapter 31. Options Options are set
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Chapter 32. Gotchas Turandot: Gli e
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command1 2> − | command2 # Trying
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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 391 and 392: next_gen "$Cur" let "generation +=
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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
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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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