fangpeina 78420bc022 nshlib: Add stderr redirection support ... This commit implements stderr redirection in HSN, support Bash-like syntax for redirecting standard error output. Support both foreground and background commands. example: - nsh> ls noexists 2> err.log - nsh> ls noexists 2> err.log & - nsh> ls noexists 2>> err.log - nsh> sh < /dev/ttyS0 > /dev/ttyS0 2> /dev/ttyS1 & - nsh> sh < /dev/ttyS0 > /dev/ttyS0 2>&1 & Signed-off-by: fangpeina <fangpeina@xiaomi.com>		2026-04-20 15:20:24 +08:00
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nshlib.h	nshlib: Add stderr redirection support	2026-04-20 15:20:24 +08:00