219 lines
4 KiB
Bash
219 lines
4 KiB
Bash
#
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# varenv.sh
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#
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# Test the behavior of the shell with respect to variable and environment
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# assignments
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#
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expect()
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{
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echo expect "$@"
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}
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a=1
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b=2
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c=3
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d=4
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e=5
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f=6 g=7 h=8
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a=3 b=4 $CHMOD $MODE $FN
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# This should echo "3 4" according to Posix.2
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expect "3 4"
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echo $a $b
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set -k
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# Assignment statements made when no words are left affect the shell's
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# environment
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a=5 b=6 $CHMOD c=7 $MODE d=8 $FN e=9
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expect "5 6 7 8 9"
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echo $a $b $c $d $e
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$CHMOD f=7 $MODE g=8 $FN h=9
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expect "7 8 9"
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echo $f $g $h
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set +k
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# The temporary environment does not affect variable expansion, only the
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# environment given to the command
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export HOME=/usr/chet
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expect $HOME
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echo $HOME
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expect $HOME
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HOME=/a/b/c /bin/echo $HOME
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expect $HOME
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echo $HOME
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# This should echo /a/b/c
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expect /a/b/c
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HOME=/a/b/c printenv HOME
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set -k
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# This should echo $HOME 9, NOT /a/b/c 9
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expect "$HOME"
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HOME=/a/b/c /bin/echo $HOME c=9
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expect "$HOME 7"
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echo $HOME $c
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# I claim the next two echo calls should give identical output.
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# ksh agrees, the System V.3 sh does not
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expect "/a/b/c 9 /a/b/c"
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HOME=/a/b/c $ECHO a=$HOME c=9
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echo $HOME $c $a
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expect "/a/b/c 9 /a/b/c"
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HOME=/a/b/c a=$HOME c=9
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echo $HOME $c $a
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set +k
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# How do assignment statements affect subsequent assignments on the same
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# line?
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expect "/a/b/c /a/b/c"
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HOME=/a/b/c a=$HOME
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echo $HOME $a
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# The system V.3 sh does this wrong; the last echo should output "1 1",
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# but the system V.3 sh has it output "2 2". Posix.2 says the assignment
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# statements are processed left-to-right. bash and ksh output the right
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# thing
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c=1
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d=2
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expect "1 2"
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echo $c $d
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d=$c c=$d
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expect "1 1"
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echo $c $d
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# just for completeness
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unset d c
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expect unset
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echo ${d-unset}
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# no output
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export a
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a=bcde
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export a
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/bin/true 2>/dev/null
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func()
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{
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local YYZ
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YYZ="song by rush"
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echo $YYZ
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echo $A
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}
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YYZ="toronto airport"
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A="AVAR"
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echo $YYZ
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echo $A
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A=BVAR func
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echo $YYZ
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echo $A
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export A
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# Make sure expansion doesn't use assignment statements preceding a builtin
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A=ZVAR echo $A
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XPATH=/bin:/usr/bin:/usr/local/bin:.
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func2()
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{
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local z=yy
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local -a avar=( ${XPATH//: } )
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echo ${avar[@]}
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local
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}
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avar=42
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echo $avar
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func2
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echo $avar
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# try to set an attribute for an unset variable; make sure it persists
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# when the variable is assigned a value
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declare -i ivar
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ivar=10
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declare -p ivar
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unset ivar
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# export an unset variable, make sure it is not suddenly set, but make
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# sure the export attribute persists when the variable is assigned a
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# value
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export ivar
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echo ${ivar-unset}
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ivar=42
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declare -p ivar
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# make sure set [-+]o ignoreeof and $IGNOREEOF are reflected
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unset IGNOREEOF
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set +o ignoreeof
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set -o ignoreeof
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if [ "$IGNOREEOF" -ne 10 ]; then
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echo "./varenv.sh: set -o ignoreeof is not reflected in IGNOREEOF" >&2
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fi
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unset IGNOREEOF
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set +o ignoreeof
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# older versions of bash used to not reset RANDOM in subshells correctly
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[[ $RANDOM -eq $(echo $RANDOM) ]] && echo "RANDOM: problem with subshells"
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# make sure that shopt -o is reflected in $SHELLOPTS
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# first, get rid of things that might be set automatically via shell
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# variables
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set +o posix
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set +o ignoreeof
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set +o monitor
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echo $-
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echo ${SHELLOPTS}
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shopt -so physical
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echo $-
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echo ${SHELLOPTS}
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# and make sure it is readonly
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readonly -p | grep SHELLOPTS
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# This was an error in bash versions prior to bash-2.04. The `set -a'
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# should cause the assignment statement that's an argument to typeset
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# to create an exported variable
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unset FOOFOO
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FOOFOO=bar
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set -a
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typeset FOOFOO=abcde
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printenv FOOFOO
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# test out export behavior of variable assignments preceding builtins and
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# functions
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$THIS_SH ./varenv1.sub
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# more tests; bugs in bash up to version 2.05a
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$THIS_SH ./varenv2.sub
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# more tests; bugs in bash IFS scoping up through version 4.2
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$THIS_SH ./varenv3.sub
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# scoping problems with declare -g through bash-4.2
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${THIS_SH} ./varenv4.sub
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# more scoping and declaration problems with -g and arrays through bash-4.2
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${THIS_SH} ./varenv5.sub
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# variable scoping in the presence of nameref
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${THIS_SH} ./varenv6.sub
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# make sure variable scoping is done right
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tt() { typeset a=b;echo a=$a; };a=z;echo a=$a;tt;echo a=$a
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