“Split”返回多余的字符(“Split” returns redundant characters)

 var res = child.execSync("df -l | awk \'{t += $2} END {printf \"%d G\\n\", t / 2^20 + 0.5}\'"); 
 
 作品，测试。 
 
 \n 。问题在于\n 。 它应该是\\n 。 您可以像这样调试任何shell任务： console.log(SHELL_COMMAND) ，然后手动运行输出字符串。 
 
 例如，这个： 
 
var child = require('child_process');
var cmd = "df -l | awk '{t += $2} END {printf \"%d G\n\", t / 2^20 + 0.5}'";
console.log(cmd)
var res = child.execSync(cmd);
 
 将在控制台中输出并尝试运行此操作： 
 
df -l | awk '{t += $2} END {printf "%d G
", t / 2^20 + 0.5}'
 
 这没有意义。 

var res = child.execSync("df -l | awk \'{t += $2} END {printf \"%d G\\n\", t / 2^20 + 0.5}\'");
 
works, tested.
 
The problem was with \n. It should be \\n. You can debug any shell task like this: console.log(SHELL_COMMAND) and then mannually run output string.
 
For example, this:
 
var child = require('child_process');
var cmd = "df -l | awk '{t += $2} END {printf \"%d G\n\", t / 2^20 + 0.5}'";
console.log(cmd)
var res = child.execSync(cmd);
 
will output in console and try to run this:
 
df -l | awk '{t += $2} END {printf "%d G
", t / 2^20 + 0.5}'
 
which makes no sense.