40 lines
1003 B
Bash
40 lines
1003 B
Bash
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#!/usr/bin/env bash
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#-------------------------------------------------------------------------------
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# Example 6 for Bash Tips show 21: a poor way to make a configuration file
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#-------------------------------------------------------------------------------
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#
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# Example configuration file using 'export'
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#
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CFG1='bash21_ex6_1.cfg'
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if [[ ! -e $CFG1 ]]; then
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echo "Unable to find $CFG1"
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exit 1
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fi
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#
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# Alternative configuration file using 'declare', converted from the other one
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#
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CFG2='bash21_ex6_2.cfg'
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#
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# Strip out all of the 'export' commands with 'sed' in a process substitution,
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# turning the lines into simple variable declarations. Use 'source' to obey
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# all of the resulting commands
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#
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source <(sed 's/^export //' $CFG1)
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#
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# Scan the (simple) variables beginning with '_CFG_' and convert them into
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# a portable form by saving the output of 'declare -p'
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#
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declare -p "${!_CFG_@}" > $CFG2
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#
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# Now next time we can 'source' this file instead when we want the variables
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#
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cat $CFG2
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exit
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