Use POSIX-compliant method to find isabelle command.
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@ -177,7 +177,7 @@ isa_version_cmd (){
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echo `Isabelle version | sed -e 's/:.*//' -e 's/Isabelle//'`
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}
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isa_version_dir() {
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echo `which isabelle | sed -e 's/.*Isabelle//' -e 's/.bin.*//'`
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echo `command -v isabelle | sed -e 's/.*Isabelle//' -e 's/.bin.*//'`
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}
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prompt_isabelle_env() {
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ISADIR=false
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