pgrep -U 无法识别，与容器里的pgrep指令不匹配

[yangcoolq]

cat: can't open '/root/.sandbox.token': No such file or directory

• test -n '' -a -z ''
• check_permission
• pgrep java
• grep 1
• pgrep -U root
• grep 1
  pgrep: unrecognized option: U
  BusyBox v1.27.2 (2017-12-12 10:41:50 GMT) multi-call binary.

Usage: pgrep [-flanovx] [-s SID|-P PPID|PATTERN]

Display process(es) selected by regex PATTERN

-l	Show command name too
-a	Show command line too
-f	Match against entire command line
-n	Show the newest process only
-o	Show the oldest process only
-v	Negate the match
-x	Match whole name (not substring)
-s	Match session ID (0 for current)
-P	Match parent process ID

• exit_on_err 1 'permission denied, root is not allow attach to 1.'
• [[ -n permission denied, root is not allow attach to 1. ]]
• echo 'permission denied, root is not allow attach to 1.'
  permission denied, root is not allow attach to 1.

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以上问题，其他人也提到过

[oldmanpushcart]

@z529192557 在docker下有遇到pgrep不可用么？我没有docker环境的经验。
@yangcoolq 能否帮助我们完善呢

1. 小建议：不要用root来执行
2. 期待回馈：我们没有你的环境比较难重现问题，sandbox.sh建议在实际公司部署的时候根据自己的环境情况进行修改，同时我们也很乐意能接收到你的pull-request