I need to know if xclip (the command is installed) because if it is available I want to send a command to it via the system() function, otherwise I want to display a message. Is there a way to know if the command exists?
我需要知道是否安装了xclip(命令)，因为如果它可用，我想通过system()函数向它发送命令，否则我想显示一条消息。是否有办法知道该命令是否存在?
Thanks
谢谢
I mean programably
我的意思是可编程的
2 个解决方案
#1
3
For something like xclip, you can just do:
对于xclip这样的东西，你只需要:
if (system("xclip")==-1) // Check for command execution failed
...
and check the return value. A -1 indicates that xclip was not found. Or, you can execute something like:
检查返回值。A -1表示没有找到xclip。或者，您可以执行以下操作:
if (system("which xclip")==0) // Check if command can be found
...
and check for a 0 return, indicating no failed arguments.
检查是否返回0，表示没有失败的参数。
#2
0
The which -s command can take in the name of a command and set $? to 0 if it could find it, 1 otherwise
哪个-s命令可以接受命令的名称并设置$?如果它能找到它，则为0。
#1
3
For something like xclip, you can just do:
对于xclip这样的东西，你只需要:
if (system("xclip")==-1) // Check for command execution failed
...
and check the return value. A -1 indicates that xclip was not found. Or, you can execute something like:
检查返回值。A -1表示没有找到xclip。或者，您可以执行以下操作:
if (system("which xclip")==0) // Check if command can be found
...
and check for a 0 return, indicating no failed arguments.
检查是否返回0，表示没有失败的参数。
#2
0
The which -s command can take in the name of a command and set $? to 0 if it could find it, 1 otherwise
哪个-s命令可以接受命令的名称并设置$?如果它能找到它，则为0。