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Bug with assignments in some commands



Hi there,

I believe I have found a bug: in arithmetic $(( )) or $[ ] and variable expansions ${ } in some forms of command (pipelines, command substitutions, and inside here-documents and here-strings are the cases I know of so far), assignments to variables do not persist outside the command, almost as if it were in a subshell. I'm pretty sure this is a bug; if it's an intended behaviour, it's quite annoying and should be changed.

This does not occur in complex commands (if, for, while, etc.) except subshells.

This occurs on both zsh versions I have tested: 5.8 (x86_64-pc-linux-gnu) and 5.6.2 (x86_64-redhat-linux-gnu).

Attached is a reproducible example, and the output of `set` and `set -o`.

Regards,

Patrick

# this increments x
x=1
echo "$((x++)), x is $x"
echo x is correct: $x

echo '========='

# but this doesn't change x outside the pipeline
x=1
echo "$((x++)), x is $x" | cat
echo x is still: $x

echo '========='

# same thing with non-arithmetic assignments ${name::=value}
# this works
x=1
echo "${x::=2}, x is $x"
echo x is correct: $x

echo '========='

# but this doesn't
x=1
echo "${x::=2}, x is $x" | cat
echo x is still: $x

echo '========='

x=1
echo $(echo "$((x++)), x is $x")
echo x is still: $x

echo '========='

x=1
<<<"$((x++)), x is $x"
echo x is still: $x

echo '========='

x=1
cat <<<"$((x++))"
echo x is still: $x

echo '========='

x=1
<<END
$((x++)), x is $x
END
echo x is still: $x

echo '========='

x=1
cat <<END
$((x++)), x is $x
END
echo x is still: $x
!=0
'#'=0
'$'=16129
'*'=(  )
-=569X
0=REDACTED
'?'=0
@=(  )
ARGC=0
BASH_ENV=REDACTED
CDPATH=''
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CPUTYPE=x86_64
EGID=1000
EUID=1000
FIGNORE=''
FPATH=/usr/local/share/zsh/site-functions:/usr/share/zsh/site-functions:/usr/share/zsh/5.6.2/functions
FUNCNEST=500
GID=1000
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PS4='+%N:%i> '
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fignore=(  )
fpath=( /usr/local/share/zsh/site-functions /usr/share/zsh/site-functions /usr/share/zsh/5.6.2/functions )
funcfiletrace
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histchars='!^#'
history
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mailpath=(  )
manpath=(  )
module_path=( /usr/lib64/zsh/5.6.2 )
modules
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path=( /usr/local/bin /usr/bin /bin )
pipestatus=( 0 )
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signals=( EXIT HUP INT QUIT ILL TRAP ABRT BUS FPE KILL USR1 SEGV USR2 PIPE ALRM TERM STKFLT CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH POLL PWR SYS ZERR DEBUG )
status=0
termcap
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userdirs
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watch=(  )
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x=1
zsh_eval_context=( toplevel )
zsh_scheduled_events

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incappendhistory      off
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ksharrays             off
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posixtraps            off
printeightbit         off
printexitvalue        off
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nopromptcr            off
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shfileexpansion       off
shglob                off
shinstdin             off
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shwordsplit           off
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sourcetrace           off
sunkeyboardhack       off
transientrprompt      off
trapsasync            off
typesetsilent         off
nounset               off
verbose               off
vi                    off
warncreateglobal      off
warnnestedvar         off
xtrace                off
zle                   off


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