Advanced Bash−Scripting Guide

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Advanced Bash−Scripting Guide b=èxpr $a \< 10` echo "If a < 10, b = 1 (true)" echo "b = $b" # 1 ( 3 −lt 10 ) echo # Note escaping of operators. b=èxpr $a \
echo Number of digits at the beginning of \"$a\" is $b. b=èxpr match "$a" '$[0−9]*$'` # Note that escaped parentheses # == == + trigger substring match. echo "The digits at the beginning of \"$a\" are \"$b\"." echo exit 0 Advanced Bash−Scripting Guide The : operator can substitute for match. For example, b=èxpr $a : [0−9]*` is the exact equivalent of b=èxpr match $a [0−9]*` in the above listing. #!/bin/bash echo echo "String operations using \"expr \$string : \" construct" echo "===================================================" echo a=1234zipper5FLIPPER43231 echo "The string being operated upon is \"èxpr "$a" : '$.*$'`\"." # Escaped parentheses grouping operator. == == # *************************** #+ Escaped parentheses #+ match a substring # *************************** # If no escaped parentheses... #+ then 'expr' converts the string operand to an integer. echo "Length of \"$a\" is èxpr "$a" : '.*'`." # Length of string echo "Number of digits at the beginning of \"$a\" is èxpr "$a" : '[0−9]*'`." # −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− # echo echo "The digits at the beginning of \"$a\" are èxpr "$a" : '$[0−9]*$'`." # == == echo "The first 7 characters of \"$a\" are èxpr "$a" : '$.......$'`." # ===== == == # Again, escaped parentheses force a substring match. # echo "The last 7 characters of \"$a\" are èxpr "$a" : '.*$.......$'`." # ==== end of string operator ^^ # (actually means skip over one or more of any characters until specified #+ substring) echo exit 0 This example illustrates how expr uses the escaped parentheses −− $ ... $ −− grouping operator in tandem with regular expression parsing to match a substring. Chapter 12. External Filters, Programs and Commands 157
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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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Chapter 10. Loops and Branches Oper
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Page 117 and 118: As is the case with for/in loops, p
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Page 155 and 156: cat, tac # Burn the CDR. cdrecord
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Page 159 and 160: exit $E_CHANGED_MIND ;; *) echo "De
Page 161: The multiplication operator must be
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Page 177 and 178: The −d option deletes a range of
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Page 201 and 202: mailto Similar to the mail command,
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Advanced Bash−Scripting Guide car
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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 Thi
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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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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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echo "one two three" | read a b c #
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Chapter 33. Scripting With Style Ge
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Advanced Bash−Scripting Guide See
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Advanced Bash−Scripting Guide # i
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Advanced Bash−Scripting Guide # T
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Advanced Bash−Scripting Guide tpu
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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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Advanced Bash−Scripting Guide #+
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Advanced Bash−Scripting Guide pad
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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 } z
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Advanced Bash−Scripting Guide } e
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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 /GU
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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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Advanced Bash−Scripting Guide } X
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Advanced Bash−Scripting Guide pow
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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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