Question

我现在要记一下我有多少次担任指挥官,因此我创建了一个档案,以储存该票。当我操作<代码>时,目标在于以新的价值取代档案。迄今为止,成功。但后来打电话到<代码>,我能运行。得出同样的结果,不会再 over过档案。

如果我关闭指挥线并重新启动指挥线,事情就会被罚款。 I m 试图说明为什么在my_Function末尾的“账面_file_path” 在<代码>~/.bash_profile中,我没有这样说。任何想法?

${HOME}/bash/.bash_count

#!/bin/bash

declare MY_LDAP_MY_FUNCTION_COUNT=0

在我的发言中,我提供了档案。当我指挥时,我想加一下,把它写到档案中。

${HOME}/bash/.bash_my_functions

my_function () {
    local count_file_path="${HOME}/bash/.bash_count"

    local curr_count="$MY_LDAP_MY_FUNCTION_COUNT"
    echo "curr_count: $curr_count"

    local incremented=$((curr_count+1))

    # Overwrite existing .bash_count file with new value
    printf  #!/bin/bash

declare MY_LDAP_MY_FUNCTION_COUNT=%s
  "$incremented" > "$count_file_path"

    source "$count_file_path"

    cat "$count_file_path" # same result every time unless I quit and restart the command line
}

Answer 1

I m not sure how you are invoking your function but it seems likely the environment value is not what you think it is. You could try printing the value of MY_LDAP_MY_FUNCTION_COUNT before you update the file.

另一种做法是使用环境变量,并且应当能够安全地避免多重同时发生的职业(代谢法有改性-高标准竞赛),但是一种比较少的细化。

1. 启动关键价值储存(使用更敏感的名称):

sqlite3 ~/bash/counters.db  
    create table t (k,v);
    insert into t values("MY_LDAP_MY_FUNCTION_COUNT",0);

更新:

sqlite3 ~/bash/counters.db  
    update t set v=v+1 where k="MY_LDAP_MY_FUNCTION_COUNT";

改为:

sqlite3 ~/bash/counters.db  
    select v from t where k="MY_LDAP_MY_FUNCTION_COUNT";

These can be parameterised and assigned to shell functions or scripts.

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