我想问您并请求脚本这一特定部分的帮助-我想使其变得更紧凑，因为我觉得它太长了，否则我可能会使用更短的语法...
这部分是从我的脚本中剪切下来的，用于创建X个数量的文件（降序跳1天，因此每个文件比上一个日期早1天），这已经比整个“实现”部分长3倍。
This part's purpose is to maintain, check and correct (appropriately) the arguments defined with the script execution, which looks like
./script.sh X X
whereas script expects two arguments (number indicating amount of files to create and the path to the folder, where it is supposed to create those0:
- if there is just 1 it assumes the user wants to create files in the present folder, therefore it checks, if the one included argument is a number and if it is it will add output from pwd to the path (in this case to not have some sort of "cross-mount" accident with the system variable PATH conveniently named PATHX), so there will be two arguments at the end anyway
- if there are more than 2, it will terminate the script
If there are 2 arguments, it performs additional "tasks:
1. checks if there are just two numbers, if so, script ends
2. checks if there are just two words/letters, if so, script ends
3. if there are, let's say, just two dots as arguments, it will end anyway as there is one if, which always will need one argument to be just number
4. after first steps this will save the arguments to the variables (it is necessary as I have had some problems in the implementation part), this step even coves any possible combination of the positions of the arguments (it does not matter now, if the amount is first or second; same for the path)
5. this is a very last step, which just (for any case) covers the case, the path included has not been inserted with the slash in front (as this is mandatory for bash to recognise it indicates an absolute path) or at the end (important for the touch command in the implementation path as the command looks like "touch -t *TIMESTAMP* "$PATHXfile$i""); together with it it does provide an appropriate action, if the path is defined with ".","..","./","../" - if there would be a full path, not relative one
if [[ $# -eq 2 ]]
then
if [[ $1 == ?(-)+([0-9]) ]] && [[ $2 == ?(-)+([0-9]) ]]
then
echo "Invalid arguments. Did you include a slash at the start of the path (if the file name consists only of the numbers)? Well, try it again. Terminating script..."
exit
elif [[ $1 == ?(-)+([a-z]) ]] && [[ $2 == ?(-)+([a-z]) ]]
then
echo "Only characters in the arguments. Is this some sort of a joke? If you have tried some sick hexadecimal format of number (just A-F), it will not work, mate. Terminating script..."
exit
fi
if [[ $1 == ?(-)+([0-9]) ]]
then
AMOUNT=$1
PATHX=$2
else
AMOUNT=$2
if [[ $AMOUNT != ?(-)+([0-9]) ]]
then
echo "No argument with number/numbers-only as an amount of files to create. Terminating script..."
exit
fi
PATHX=$1
fi
else
if [[ $# -eq 1 ]]
then
if [[ $1 == ?(-)+([0-9]) ]]
then
AMOUNT=$1
PATHX=$(pwd)
else
echo "Please, include the argument with an amount of files to create. Terminating script..."
exit
fi
else
echo "2 Arguments are expected. Terminating script..."
exit
fi
fi
if [[ $PATHX != /* ]]
then
if [[ "$PATHX" == "." ]] || [[ "$PATHX" == ".." ]] || [[ "$PATHX" == "./"* ]] || [[ "$PATHX" == "../"* ]]
then
true
else
PATHX=$(echo "/$PATHX")
fi
fi
if [[ $PATHX != */ ]]
then
PATHX=$(echo "$PATHX/")
fi
请原谅这种格式，但是没有在代码示例中添加说明，只是一团糟的文本...总之，谢谢你们，Guys，任何输入。
它可以简化为：
[[ $# -gt 2 ]] && { echo "Incorrect number of arguments"; exit 1; }
[[ $1 == ?(-)+([0-9]) ]] || { echo "First argument is not a number"; exit 2; }
[[ $2 == ?(-)+([0-9]) ]] && { echo "Both arguments are numbers"; exit 3; }
[[ $2 == +([a-z]) ]] || { echo "File name must be only letters"; exit 4; }
[[ ! -d $2 ]] && { echo "Path does not exist"; exit 5; }
n=$1
p=${2:-$PWD} # Use the PWD if path is missing.
if [[ $p != */ ]]; then
echo "Missing trailing slash; correcting";
p+=/
fi
if [[ $p != /* ]]; then
echo "Missing leading slash; correcting";
[[ $p == @(.|..|./*|../*) ]] || p=/"$p"
fi
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