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Warn about $_ in POSIX sh (fixes #1647)

This commit is contained in:
Vidar Holen 2019-07-21 21:22:16 -07:00
parent 023ae5dfda
commit 38bb156a1c
1 changed files with 5 additions and 2 deletions
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7
src/ShellCheck/Checks/ShellSupport.hs
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@ -175,6 +175,8 @@ prop_checkBashisms91 = verify checkBashisms "#!/bin/sh\nwait -n"
prop_checkBashisms92 = verify checkBashisms "#!/bin/sh\necho $((16#FF))"
prop_checkBashisms93 = verify checkBashisms "#!/bin/sh\necho $(( 10#$(date +%m) ))"
prop_checkBashisms94 = verify checkBashisms "#!/bin/sh\n[ -v var ]"
prop_checkBashisms95 = verify checkBashisms "#!/bin/sh\necho $_"
prop_checkBashisms96 = verifyNot checkBashisms "#!/bin/dash\necho $_"
checkBashisms = ForShell [Sh, Dash] $ \t -> do
params <- ask
kludge params t
@ -408,10 +410,11 @@ checkBashisms = ForShell [Sh, Dash] $ \t -> do
]
bashVars = [
"OSTYPE", "MACHTYPE", "HOSTTYPE", "HOSTNAME",
"DIRSTACK", "EUID", "UID", "SHLVL", "PIPESTATUS", "SHELLOPTS"
"DIRSTACK", "EUID", "UID", "SHLVL", "PIPESTATUS", "SHELLOPTS",
"_"
]
bashDynamicVars = [ "RANDOM", "SECONDS" ]
dashVars = [ ]
dashVars = [ "_" ]
isBashVariable var =
(var `elem` bashDynamicVars
|| var `elem` bashVars && not (isAssigned var))