Advanced Bash−Scripting Guide

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Advanced Bash−Scripting Guide filter () { # Filter out negative array indices. echo −n " " # Provides the tilt. if [[ "$1" −ge 0 && "$1" −lt "$Rows" && "$2" −ge 0 && "$2" −lt "$Columns" ]] then let "index = $1 * $Rows + $2" # Now, print it rotated. echo −n " ${alpha[index]}" # alpha[$row][$column] fi } rotate () # Rotate the array 45 degrees { # ("balance" it on its lower lefthand corner). local row local column for (( row = Rows; row > −Rows; row−− )) # Step through the array backwards. do for (( column = 0; column < Columns; column++ )) do if [ "$row" −ge 0 ] then let "t1 = $column − $row" let "t2 = $column" else let "t1 = $column" let "t2 = $column + $row" fi filter $t1 $t2 done # Filter out negative array indices. echo; echo done # Array rotation inspired by examples (pp. 143−146) in # "Advanced C Programming on the IBM PC", by Herbert Mayer # (see bibliography). } #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−# load_alpha # Load the array. print_alpha # Print it out. rotate # Rotate it 45 degrees counterclockwise. #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−# # This is a rather contrived, not to mention kludgy simulation. # # Exercises: Chapter 26. Arrays 308
# −−−−−−−−− # 1) Rewrite the array loading and printing functions # + in a more intuitive and elegant fashion. # # 2) Figure out how the array rotation functions work. # Hint: think about the implications of backwards−indexing an array. exit 0 Advanced Bash−Scripting Guide A two−dimensional array is essentially equivalent to a one−dimensional one, but with additional addressing modes for referencing and manipulating the individual elements by "row" and "column" position. For an even more elaborate example of simulating a two−dimensional array, see Example A−11. Chapter 26. Arrays 309
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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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Chapter 3. Special Characters Speci
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Advanced Bash−Scripting Guide \ /
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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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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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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 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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Page 273 and 274: Chapter 20. Subshells Running a she
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Page 285 and 286: # Range: 0 − 200 # It's crude, bu
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Page 289 and 290: # grep PATTERN /etc/passwd | awk
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1−56592−580−7). This is the s
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Bibliography Edited by Peter Dennin
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Advanced Bash−Scripting Guide * A
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Mark Komarinski's Printing−Usage
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Advanced Bash−Scripting Guide #+
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Advanced Bash−Scripting Guide arr
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let "row = $r" # Count center row o
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next_gen "$Cur" let "generation +=
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[−c localdirectory] [−m filepat
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Advanced Bash−Scripting Guide # =
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Advanced Bash−Scripting Guide #:d
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# ListDirectory "FileGlob" "Field
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Advanced Bash−Scripting Guide # I
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The md5sum program is documented as
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Note: 'mount −l' does return the
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Appendix B. A Sed and Awk Micro−P
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Appendix D. A Detailed Introduction
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Appendix E. Localization Localizati
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Appendix F. History Commands The Ba
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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 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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