##bash alias permissible meta-chars

I like “typing tutors”

I also like a family of alias like nx- nx, nx.

		allowed in alias	no shift
-(dash)		good	good
, (comma)		good	good
. (dot)		good	good
+ (plus)		good	good
!		good	bad
= (equals)		bad
backtick		bad
/ or \		bad

 

 

simple cpp code: convert current or file mtime to struct tm

least amount of code

struct stat buffer;
stat(m_secInfoFileName.c_str(), &buffer);
cerr<<localtime(&buffer.st_mtime)      ->tm_mday<<endl;
cerr<<localtime(new time_t(time(NULL)))->tm_mday<<endl;

quickly identify PID hold`a port #netstat

netstat has -p flag

netstat -pln |grep 40493

## vi cheatsheet

• ~~~~ command mode #roughly ranked
• from inside q(LESS), type a single “v” to launch vi
• Ctrl-R to re-do
• [1] ctrl-^ — to switch to “the other file”
• [3] :e# — is same
• cw — wipe out from cursor to end of word and puts you into insert mode
• • c2w or 2cw
• capital O — open new line above cursor
• R — Overwrite each character one by one until end of line. Useful if the replacement content is similar to original?
• C — wipe out from cursor to END of line and puts you into insert mode
• A — to append at END of current line
• [3] dt — “dta” delete until the next “a”

[3] means vi receives 3 keystrokes

windows stickyNote^outlook note

Purpose: temp reminders

	on top	visibility	hide	folder tree
sticky note	y	good	no 😦	no
outlook note	y	good	yes	yes 🙂
paper note	y	best	yes

scan codebase for a given func name

–Challenge: scan a c++ codebase for a given func name

• A script would offer more flexibility.
• find + perl + grep is a crude solution, without support for comments

See also the task in Outlook!

–A related challenge: suppose you have the definition of a function, how do you see all the callers?

• Technique using compiler warning — http://stackoverflow.com/questions/1140509/how-to-find-all-callers-of-a-function-in-c . Tested:  able to report the line number of caller:

Csmi.C: In static member function ‘static csmiparser::Csmi& csmiparser::Csmi::getInstance()’:
Csmi.C:14: warning: ‘__comp_ctor ’ is deprecated (declared at /home/vtan/tp/plugins/xtap/csmi/include/Csmi.h:33)

• Technique — Rename the by appending _xxx and rebuild

 

##windoz ftp client without admin permission

• experience — in Win7 MSWE, I was able to type

ftp:username@hostname

System prompted and saved my password 🙂

• experience — I installed FileZillaPortable in my own dir and it could connect to a linux site, remembering my credentials

create desktop shortcut to a putty remote host

Copy putty.exe into c:\windows

Create shortcut http://www.htpcbeginner.com/putty-shortcut-to-saved-session/

“putty -load ficsinapd01 -l vtan7”

identify unix disk hogs

du -csxPBM * | sort -n

du -cks * |sort -n |tail

du -h –max-depth=1 | tee ~/diskUsage2.log

C++read number from file->variable #briefly

ifstream myfile((tmpDir.str()+"_config").c_str());
if (myfile) // file may not exist
   myfile>>packetDumpLimit;