Question

我想检查输入的值是否是文件中第一行值的重复值。

这是我的代码，但它不起作用

printf "Enter Table Name: "
read tableName
printf "Enter new Value: "
read value
for j in $(awk -F':'  '{if(NR>2) printf $1 }' $tableName); do
        if(value -eq $j); then
          printf "duplicated"
        else
          printf "not duplicated"

Answer 1

将代码传递给shellcheck.net，您就可以自己发现问题。

您可以使用grep代替使用awk：

进行循环

printf "Enter Table Name: "
read tableName
printf "Enter new Value: "
read value
if grep -qx -- "$value" <(cut -f2 -d: "$tableName"); then
  echo "duplicated"
else
  echo "not duplicated"
fi

最好在运行grep之前验证输入的值：

printf "Enter Table Name: "
read tableName
[[ -z "$tableName" ]] && printf "No value entered for table name.\n" >&2 && exit 1
[[ ! -f "$tableName" ]] && printf "File '%s' does not exist.\n" "$tableName" >&2 && exit 1
printf "Enter new Value: "
read value
[[ -z "$value" ]] && printf "No value entered.\n" >&2 && exit 1
if grep -wq -- "$value" <(cut -f2 -d: "$tableName"); then
  echo "duplicated"
else
  echo "not duplicated"
fi

如何在Bash中检查唯一列

1 个答案: