String comparison: Difference between revisions
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=={{header|UNIX Shell}}== |
=={{header|UNIX Shell}}== |
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Traditional bourne shell (which used the 'test' command for comparisons) had no way of doing lexical comparisons. |
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<lang sh>#!/bin/sh |
<lang sh>#!/bin/sh |
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# However this may not be the case if other tools, such as awk are the slave instead of test.</lang> |
# However this may not be the case if other tools, such as awk are the slave instead of test.</lang> |
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Bash and other POSIX shells do support lexical comparisons: |
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<lang bash> |
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#!/bin/bash |
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isint() { |
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printf "%d" $1 >/dev/null 2>&1 |
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} |
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compare() { |
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local a=$1 |
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local b=$2 |
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[[ $a = $b ]] && echo "'$a' and '$b' are lexically equal" |
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[[ $a != $b ]] && echo "'$a' and '$b' are not lexically equal" |
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[[ $a > $b ]] && echo "'$a' is lexically after '$b'" |
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[[ $a < $b ]] && echo "'$a' is lexically before '$b'" |
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shopt -s nocasematch # Turn on case insensitivity |
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[[ $a = $b ]] && echo "'$a' and '$b' are equal with case insensitivity" |
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shopt -u nocasematch # Turn off case insensitivity |
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# If args are numeric, perform some numeric comparisions |
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if isint $a && isint $b |
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then |
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[[ $a -eq $b ]] && echo "$a is numerically equal to $b" |
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[[ $a -gt $b ]] && echo "$a is numerically greater than $b" |
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[[ $a -lt $b ]] && echo "$a is numerically less than $b" |
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fi |
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echo |
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} |
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compare foo foo |
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compare foo bar |
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compare FOO foo |
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compare 24 123 |
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compare 50 20 |
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</lang> |
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{{omit from|Brlcad}} |
{{omit from|Brlcad}} |
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