Opening and closing brackets do not matchSH-1033Missing `fi` statement hereSH-1047Missing `}`SH-1056Missing `done` statementSH-1061Missing `then` statementSH-1050Semicolon detected after `else`SH-1053`[ .. ]` is not a part of shell syntaxSH-1014No `fi` found for the `if` statementSH-1046Wrong way of declaring parametersSH-1065Missing `EOF` tokenSH-1044Unescaped `&` will end the command hereSH-1132Consider using `elif` instead of `if`SH-1075File has UTF-8 BOMSH-1082Unexpected line-startSH-1133Terminator used after here documentSH-1121Avoid using literal tilde in PATHSH-2147`for` loop used on `find` outputSH-2044Empty `then` clause detectedSH-1048Missing whitespaceSH-1020Semicolon detected after `then`SH-1051Missing space after `{`SH-1054Found 'eof' further down, but not on a separate lineSH-1041Non-alphanumeric names may have been skippedSH-2038Found a comment after here-doc tokenSH-1120Consider using command substitution instead of `'...'`SH-2041Avoid use of `ls | grep`SH-2010Consider using command substitution to assign the output of a pipelineSH-2036Missing space after `$(`SH-1102Leading spaces detected befor shebangSH-1114Missing command substitutionSH-2037Iterating over a constant valueSH-2043Consider using glob to iterate over `ls` outputSH-2045Consider using a `( subshell )` to avoid having to `cd` backSH-2103Functions must not return multiple valuesSH-2151Array expansion in string arguments may have unexpected resultsSH-2145Evaluation order of arguments to `find` might be different than expectedSH-2146Use `-exec sh -c` to invoke a shell with `find`SH-2150Missing space after `<`SH-1038`$` used on the left side of an assignmentSH-1066Whitespace found after `=`SH-1007Apostrophe terminates the single quoted stringSH-1011Missing `then` for the `if` statementSH-1049Unary test operator not followed by a valid shell wordSH-1019Missing `do` statementSH-1058Unescaped `$` used in a literal contextSH-1000Consider using `find` instead of `ls` to better handle non-alphanumeric filenamesSH-2012Lexicographical comparison operator used for numerical comparisonSH-2071Escape `\<` to prevent it redirecting (or switch to `[[ .. ]]`)SH-2073Mismatched keywordSH-1089Invalid use of parenthesesSH-1088`-n` doesn't work with unquoted argumentsSH-2070Unexpected character after terminating `]`SH-1136Consider using `pgrep` instead of grepping `ps` outputSH-2009Shell functions passed to an external commandSH-2033use of an invalid operatorSH-2122Found word outside quotesSH-2026Unknown unary operatorSH-2058Keyword is not in lower caseSH-1081Loop will run only once because there's no word splittingSH-2066Double quote array expansions to avoid re-splitting elementsSH-2068Unnecessary use of `$` / `${}` with arithmetic variableSH-2004Shebang with more than one parameterSH-2096Missing `$`SH-1116shebang is not the first lineSH-1128Quote 'EOF' to make here document expansions happen on the server side rather than on the clientSH-2087Bash doesn't allow variables in brace range expansionsSH-2051`[ .. ]` can't match globsSH-2081Unexpected `==`SH-1097Variable modified locally due to `pipe`SH-2030Command substitutions will run *before* the enclosing command instead of within itSH-2014String not closedSH-1078`=~` is not allowed in `[ ]`SH-2074`>` behaves like a redirection operator hereSH-2065Unknown binary operatorSH-2057Shell functions passed to `su`SH-2032Missing newline between the end token and terminating `)`SH-1119`||` is not supported inside `[ .. ]`SH-2109`break` used outside of a loopSH-2105Use `[ a ] && [ b ]` instead of `[ a && b ]`SH-2107Invalid `-o` in `[[..]]`SH-2110A system directory is being deletedSH-2114Aliases can't use positional parametersSH-2142Consider using a `for` loop instead of `-e`SH-2144Variables must be defined before useSH-2154Syntax errorSH-1070`(( ))` doesn't support decimalsSH-2079C language style commentSH-1127Consider using `&&` instead of `-a` in `[[..]]`SH-2108Unicode double quotes detectedSH-1015Can't escape `(` or `)` inside `[[..]]`SH-1029`eof` is not on a separate lineSH-1042Single quote not escaped properlySH-1003Braces are required for positionals over 9SH-1037Unicode single quote usedSH-1016Invalid or unescaped `(` foundSH-1036Script uses carriage return ` `SH-1017Function definition missing bodySH-1064Unnecessary use of multiple line terminatorsSH-1045Assigning to a dynamically created variableSH-1067Missing space before `[`SH-1069backslash / linefeed is a literal where it is usedSH-1004Detected a literal where `tab`, `linefeed` or `cariage return` might be expectedSH-1012Escape `(` and `)` or preferably combine `[..]` expressionsSH-1028Remove indentation before end tokenSH-1039Use `( .. )` to group conditionsSH-1026Unicode non-breaking space foundSH-1018Use tabs for indentationSH-1040Detected spaces around `=` operatorSH-1068Use semicolon or linefeed before `done`SH-1010Missing whitespaceSH-1035Whitespace detected between `#` and `!` in the `shebang`SH-1115Deprecated `$[..]` usedSH-2007Unicode quote detectedSH-1110Missing `!` in shebangSH-1113Executing output of a commandSH-2091Unused variableSH-2034Useless `cat`SH-2002Consider escaping `$` to make it a literalSH-1135Consider using `$HOME` instead of tilde `~` to expand in quotesSH-2088Whitespace detected after the here-doc end tokenSH-1118Consider using braces to expand arraysSH-1087`tr` used to replace wordsSH-2020Remove `exec` if script should continue after this commandSH-2093Consider escaping special characters when using `eval`SH-1098Consider using `$((..))` for arithmetic operationsSH-2100Increase precision by replacing `a/b*c` with `a*c/b`SH-2017Use `[:upper:]` to support accents and foreign alphabetsSH-2019Missing space or linefeed between the function name and bodySH-1095Missing space before `!`SH-1129Consider reformattingSH-1079`echo` doesn't read from stdinSH-2008`echo` used to expand escape sequencesSH-2028Trailing spaces after `\`SH-1101Named class needs an outer `[]`SH-2101Verify use of the pipeline operatorSH-2106Consider using `func()`SH-2113Brace expansions/globs used in an assignmentSH-2125Use `=` for non-integer comparisonsSH-2130Shell search path `PATH` is being overriddenSH-2123Consider using `grep -q`SH-2143`=~` used with a globSH-2049Use spaces to separate array elementsSH-2054Consider using `while read` to read linesSH-2013Quote parameter to prevent glob expansionSH-2060Quote the passed parameter to prevent the shell from interpreting itSH-2061To redirect both `stdout` and `stderr`, `2>&1` must be last (or use `'{ cmd > file; } 2>&1'` to clarify)SH-2069Possibly missing `$`SH-2078Missing space around `=` operatorSH-1108Unnecessary use of `echo`SH-2005Remove backticks to avoid executing outputSH-2092Glob used with `grep`SH-2063Remove '$' or use '_=$((expr))' to avoid executing outputSH-2084`sudo` doesn't affect redirectsSH-2024Use `"$@"` to prevent whitespace problemsSH-2048`{` `/` `}` is a literal hereSH-1083Command swallows `stdin`SH-2095Unicode dash detectedSH-1100`$` used on the iterator name in for loopsSH-1086Unsupported decimalsSH-2072Missing space before `:`SH-1130`A && B || C` is not equivalent to `if A then B else C`SH-2015Missing `;` or `+` terminating `-exec`SH-2067Use `$((..))` for arithmetic operationSH-2099Consider using `find` for better handling non-alphanumeric filenamesSH-2011Use of variable in `printf` format stringSH-2059Unescaped enclosed quotesSH-2027Numbers with a leading `0` are considered octalSH-2080Use double quotes to expand expressionsSH-2016Quote the RHS of the operator to prevent glob matchingSH-2053Quoting RHS of `=~` will match literally rather than as a regexSH-2076Use of legacy backtickSH-2006Consider using `./` or `--` globSH-2035Enclose escape sequences in `\[..\]` to prevent line wrapping issuesSH-2025Consider using `${variable//search/replace}`SH-2001`trap` code will expand during definitionSH-2064Missing `#` in the shebang lineSH-1104Use `#!` for shebangSH-1084Comparison with literalSH-2050Unescaped argument foundSH-2029Text added after here-doc terminating tokenSH-1122Use backtick for command expansionSH-1077Variable modified in the subshellSH-2031To expand via indirection, use name="foo$n"; echo "${!name}"SH-2082Assignment visible only to the forked processSH-2097Encountered use of `[]` around ranges in `tr`SH-2021Missing spaces around the comparison operatorSH-2077Quote `grep` patterns to stop shells from interpreting themSH-2062Consider quoting command expansion to prevent word splittingSH-2046Make sure not to read and write the same file in the same pipelineSH-2094Use `[:lower:]` to support accents and foreign alphabetsSH-2018Use `elif` to start another branchSH-1131Referred argument is never passedSH-2120Do not use `set` to assign a variableSH-2121Ranges can only match single charactersSH-2102Consider using `return`SH-2104Use `"${var:?}"` to ensure this never expands to `/*`SH-2115Unnecessary use of `echo`SH-2116Use `su -c` or `sudo` to run command as another userSH-2117An array is being assigned to a stringSH-2124Consider escaping the expansionSH-2139Unquoted literal string detected between two double quoted stringsSH-2140Potentially misspelled variable name foundSH-2153Avoid using `$` with numeric or string indicesSH-2149Function returns something other than a number in the range of 0-255SH-2152Missing space before `#`SH-1099Use double quote to prevent globbing and word splittingSH-2086Unquoted HTML entity foundSH-1109Escaping a non-special characterSH-1001Outdated `expr` statementSH-2003Literal quote/backslash detected in the argument stringSH-2089Consider using single quotesSH-2141Consider using `${#variable}`SH-2000Consider grouping multiple command redirectsSH-2129Consider using `grep -c`SH-2126
Shell logoShell/
SH-1099

Missing space before `#`SH-1099

Major severityMajor
Bug Risk categoryBug Risk

Found a keyword immediately followed by a #. In order for the # to start a comment, it needs to come after a word boundary such as a space.

Problematic code:

while sleep 1
do# show time
  date
done

Preferred code:

while sleep 1
do # show time
  date
done