Busybox 环境下貌似不支持 grep -Po 这个命令，如何改呢

[matthuo333]

在脚本中有如下：
grep -Po '(?<="id":")[^"]*' | head -1 )

但是我当前环境是 BusyBox v1.24.1，貌似不支持这个 -- ‘P’的参数， 如何修改呢？

当前执行后报错：
No file, need IP
Updating zone_identifier & record_identifier
grep: invalid option -- 'P'
BusyBox v1.24.1 (2022-03-24 03:19:19 CST) multi-call binary.

Usage: grep [-HhnlLoqvsriwFE] [-m N] [-A/B/C N] PATTERN/-e PATTERN.../-f FILE [FILE]...

Search for PATTERN in FILEs (or stdin)

-H	Add 'filename:' prefix
-h	Do not add 'filename:' prefix
-n	Add 'line_no:' prefix
-l	Show only names of files that match
-L	Show only names of files that don't match
-c	Show only count of matching lines
-o	Show only the matching part of line
-q	Quiet. Return 0 if PATTERN is found, 1 otherwise
-v	Select non-matching lines
-s	Suppress open and read errors
-r	Recurse
-i	Ignore case
-w	Match whole words only
-x	Match whole lines only
-F	PATTERN is a literal (not regexp)
-E	PATTERN is an extended regexp
-m N	Match up to N times per file
-A N	Print N lines of trailing context
-B N	Print N lines of leading context
-C N	Same as '-A N -B N'
-e PTRN	Pattern to match
-f FILE	Read pattern from file

(23) Failed writing body

[CraKeyBoy]

可以以下命令替代：

 | grep -o '"id":"[^"]*' | grep -o '[^"]*$' | head -1

参考：
https://stackoverflow.com/questions/36073695/how-to-retrieve-single-value-with-grep-from-json