linux - Bash 脚本错误

Question

我正在尝试运行这些脚本，但我不断收到错误消息:

1-

#!/bin/bash

filename=$1


if [ -f $filename ]
then
    owner=`stat -c %U $filename`
    grep $owner /etc/passwd
    if [ $? -eq 0 ]; then
            perm=`stat -c %a $filename | head -c 1`
            if [ $perm -gt 3 ]; then
                cat $filename | grep NOTE
            fi
        fi
fi

错误信息是:

stat: missing operand Try `stat --help' for more information.

---

2-

#!/bin/bash

NoSum=$1
sum=0
echo "Please enter $NoSum values one at a time"
for (( i=1; i<=$NoSum; i++ ))
do
    echo "Next Value?"
    read num
    let "a = $sum + $num"
    sum=$a
done

echo "The sum is : $sum"

错误信息是:

Please enter values one at a time ./scr3: line 6: ((: i<=: syntax error: operand expected (error token is "<=") The sum is : 0

---

3-

#!/bin/bash

dir=$1

if [ -d $dir ]
    then
    perm=`stat -c %a $dir | head -c 1`
    if [ $perm -gt 5 ]; then
        cd $dir
        for file in $dir/*
        do
            if ! [ -x "$file" ]
            then
                echo "$file"
            fi
        done
    fi
fi

错误信息是:

stat: missing operand Try `stat --help' for more information. ./scr4: line 8: [: -gt: unary operator expected

---

知道如何修复它们吗？

Answer 1

程序没有任何问题。您没有提供命令行参数。您必须按以下方式运行它

1 和 3:

./script.sh <filename>

2:

./script.sh <number>

$1 代表第一个命令行参数