Growstuff/growstuff

This {/} is literal. Check expression (missing ;/\n?) or quote it.

Problematic code:

rmf() { rm -f "$@" }

or

eval echo \${foo}

Correct code:

rmf() { rm -f "$@"; }

and

eval "echo \${foo}"

Rationale:

Curly brackets are normally used as syntax in parameter expansion, command grouping and brace expansion.

However, if they don't appear alone at the start of an expression or as part of a parameter or brace expansion, the shell silently treats them as literals. This frequently indicates a bug, so ShellCheck warns about it.

In the example function, the } is literal because it's not at the start of an expression. We fix it by adding a ; before it.

In the example eval, the code works fine. However, we can quiet the warning and follow good practice by adding quotes around the literal data.

ShellCheck does not warn about {}, since this is frequently used with find and rarely indicates a bug.

Exceptions

This error is harmless when the curly brackets are supposed to be literal, in e.g. awk {'print $1'}. However, it's cleaner and less error prone to simply include them inside the quotes: awk '{print $1}'.

Notice

Original content from the ShellCheck https://github.com/koalaman/shellcheck/wiki.

This {/} is literal. Check expression (missing ;/\n?) or quote it.

Problematic code:

rmf() { rm -f "$@" }

or

eval echo \${foo}

Correct code:

rmf() { rm -f "$@"; }

and

eval "echo \${foo}"

Rationale:

Curly brackets are normally used as syntax in parameter expansion, command grouping and brace expansion.

However, if they don't appear alone at the start of an expression or as part of a parameter or brace expansion, the shell silently treats them as literals. This frequently indicates a bug, so ShellCheck warns about it.

In the example function, the } is literal because it's not at the start of an expression. We fix it by adding a ; before it.

In the example eval, the code works fine. However, we can quiet the warning and follow good practice by adding quotes around the literal data.

ShellCheck does not warn about {}, since this is frequently used with find and rarely indicates a bug.

Exceptions

This error is harmless when the curly brackets are supposed to be literal, in e.g. awk {'print $1'}. However, it's cleaner and less error prone to simply include them inside the quotes: awk '{print $1}'.

Notice

Original content from the ShellCheck https://github.com/koalaman/shellcheck/wiki.

Not following: (error message here)

Reasons include: file not found, no permissions, not included on the command line, not allowing shellcheck to follow files with -x, etc.

Problematic code:

source somefile

Correct code:

# shellcheck disable=SC1091
source somefile

Rationale:

ShellCheck, for whichever reason, is not able to access the source file.

This could be because you did not include it on the command line, did not use shellcheck -x to allow following other files, don't have permissions or a variety of other problems.

Feel free to ignore the error with a [[directive]].

Exceptions:

If you're fine with it, ignore the message with a [[directive]].

Notice

Original content from the ShellCheck https://github.com/koalaman/shellcheck/wiki.