Advanced Bash−Scripting Guide

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Advanced Bash−Scripting Guide #!/bin/bash # broken−link.sh # Written by Lee bigelow # Used with permission. #A pure shell script to find dead symlinks and output them quoted #so they can be fed to xargs and dealt with :) #eg. broken−link.sh /somedir /someotherdir|xargs rm # #This, however, is a better method: # #find "somedir" −type l −print0|\ #xargs −r0 file|\ #grep "broken symbolic"| #sed −e 's/^\|: *broken symbolic.*$/"/g' # #but that wouldn't be pure bash, now would it. #Caution: beware the /proc file system and any circular links! ############################################################## #If no args are passed to the script set directorys to search #to current directory. Otherwise set the directorys to search #to the agrs passed. #################### [ $# −eq 0 ] && directorys=`pwd` || directorys=$@ #Setup the function linkchk to check the directory it is passed #for files that are links and don't exist, then print them quoted. #If one of the elements in the directory is a subdirectory then #send that send that subdirectory to the linkcheck function. ########## linkchk () { for element in $1/*; do [ −h "$element" −a ! −e "$element" ] && echo \"$element\" [ −d "$element" ] && linkchk $element # Of course, '−h' tests for symbolic link, '−d' for directory. done } #Send each arg that was passed to the script to the linkchk function #if it is a valid directoy. If not, then print the error message #and usage info. ################ for directory in $directorys; do if [ −d $directory ] then linkchk $directory else echo "$directory is not a directory" echo "Usage: $0 dir1 dir2 ..." fi done exit 0 Example 29−1, Example 10−7, Example 10−3, Example 29−3, and Example A−2 also illustrate uses of the file test operators. Chapter 7. Tests 48
7.3. Comparison operators (binary) integer comparison −eq is equal to Advanced Bash−Scripting Guide −ne −gt −ge −lt −le < >= if [ "$a" −eq "$b" ] is not equal to if [ "$a" −ne "$b" ] is greater than if ["$a" −gt "$b" ] is greater than or equal to if [ "$a" −ge "$b" ] is less than if [ "$a" −lt "$b" ] is less than or equal to if [ "$a" −le "$b" ] is less than (within double parentheses) (("$a" < "$b")) is less than or equal to (within double parentheses) (("$a" "$b")) is greater than or equal to (within double parentheses) (("$a" >= "$b")) string comparison = Chapter 7. Tests 49
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Advanced Bash−Scripting Guide An
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Page 7 and 8: Chapter 1. Why Shell Programming? A
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Page 29 and 30: Chapter 4. Introduction to Variable
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Page 37 and 38: The shift command reassigns the pos
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Chapter 10. Loops and Branches Oper
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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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# 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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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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Chapter 15. Arithmetic Expansion Ar
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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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Example 17−11. A self−documenti
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Part 4. Advanced Topics At this poi
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"Sed & Awk", by Dougherty and Robbi
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Chapter 20. Subshells Running a she
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# Range: 0 − 200 # It's crude, bu
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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 # A
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Chapter 30. Debugging The Bash shel
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4. Advanced Bash−Scripting Guide
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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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echo "one two three" | read a b c #
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Chapter 33. Scripting With Style Ge
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#!/bin/bash # color−echo.sh: Echo
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34.7. Assorted Tips Advanced Bash
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Advanced Bash−Scripting Guide the
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Advanced Bash−Scripting Guide •
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# agram.sh: Playing games with anag
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Chapter 35. Bash, version 2 The cur
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Advanced Bash−Scripting Guide # R
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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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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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Advanced Bash−Scripting Guide dec
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Appendix B. A Sed and Awk Micro−P
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Advanced Bash−Scripting Guide Tha
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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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[33] This is actually a script adap
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# Thanks to Stephane Chazelas for p
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