Comment by amelius

Before invoking a command, always first check if the length of the command is not longer than ARG_MAX. For example, if this is your command:

    grep --ignore-case --files-with-matches -- "hello" *.c

Then invoke it as follows:

    CMD="grep --ignore-case --files-with-matches -- \"hello\" *.c"
    ARG_MAX=$(getconf ARG_MAX)
    CMD_LEN=${#CMD}

    if (( CMD_LEN > ARG_MAX )); then
        echo "Error: Command length ($CMD_LEN) exceeds ARG_MAX ($ARG_MAX)." >&2
        exit 1
    fi

    eval "$CMD" # warning, evaluates filenames