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reverse ssh tunnel nohup ssh -NfR 2222:localhost:22 root@106.12.13.xxx -p22 expect script   strip command Some useful line editing key bindings provided by the Readline library:

  • Ctrl-A: go to the beginning of line
  • Ctrl-E: go to the end of line
  • Alt-B: skip one word backward
  • Alt-F: skip one word forward
  • Ctrl-U: delete to the beginning of line
  • Ctrl-K: delete to the end of line
  • Alt-D: delete to the end of word

https://askubuntu.com/questions/45521/how-to-navigate-long-commands-faster   gprof tool https://blog.csdn.net/stanjiang2010/article/details/5655143 http://www.etalabs.net/compare_libcs.html https://git.busybox.net/buildroot/tree/toolchain/uClibc/Glibc_vs_uClibc_Differences.txt?id=6be5cb76b98091bc5623eb33776da94ce4715313``` uclibc 无法使用 gprof 进行profile。 可以使用以下工具：Profiling:

uClibc no longer supports ‘gcc -fprofile-arcs -pg’ style profiling, which causes your application to generate a ‘gmon.out’ file that can then be analyzed by ‘gprof’. Not only does this require explicit extra support in uClibc, it requires that you rebuild everything with profiling support. There is both a size and performance penalty to profiling your applications this way, as well as Heisenberg effects, where the act of measuring changes what is measured.

There exist a number of less invasive alternatives that do not require you to specially instrument your application, and recompile and relink everything.

The OProfile system-wide profiler is an excellent alternative: http://oprofile.sourceforge.net/

Many people have had good results using the combination of Valgrind to generate profiling information and KCachegrind for analysis: http://developer.kde.org/~sewardj/ http://kcachegrind.sourceforge.net/

Prospect is another alternative based on OProfile: http://prospect.sourceforge.net/

And the Linux Trace Toolkit (LTT) is also a fine tool: http://www.opersys.com/LTT/

FunctionCheck: http://www710.univ-lyon1.fr/~yperret/fnccheck/


**neon** [https://community.arm.com/processors/b/blog/posts/coding-for-neon---part-1-load-and-stores](https://community.arm.com/processors/b/blog/posts/coding-for-neon---part-1-load-and-stores) **libc and ucLibc** [http://www.etalabs.net/compare\_libcs.html](http://www.etalabs.net/compare_libcs.html)   **libuv** \[hermit auto="1" loop="0" unexpand="1" fullheight="0"\]netease\_songs#:21303927\[/hermit\]