Basic SVN Commands

Here I'm gonna show you some basic SVN commands with some examples.

Checking out

svn co http://[hostname]/trunk

Checking in

svn ci

Viewing SVN information
This will display information, such SVN URL, revision number, etc.

svn info

Viewing SVN status
This will display information, such as files modified, added, deleted, etc.

svn status

Updating the local SVN repository

svn up

Viewing the diff

svn diff

Viewing SVN logs

svn log

Adding a file into SVN

svn add new_file.txt

Moving/Renaming a file from one place to another place

svn move old_file.txt new_file.txt

Deleting a file from SVN

svn del junk_file.txt

Reverting local changes in a file

svn revert whatever_file.txt

Reverting local changes recursively

svn revert -R *

Creating a branch/tag

svn copy http://[hostname]/trunk http://[hostname]/branches/1.0
svn copy http://[hostname]/trunk http://[hostname]/tags/1.0

De-commiting changes in the trunk
This will first do a diff between HEAD and rev 123 in the trunk and then do a dry-run before performing an actual merge.

svn diff -r HEAD:1234 http:/[hostname]/trunk
svn merge -r --dry-run HEAD:1234 http:/[hostname]/trunk
svn merge -r HEAD:1234 http:/[hostname]/trunk
svn ci

Merging changes from the branch to the trunk
Assume that the current directory is where the trunk code was checked out.

svn diff -r 1234:HEAD http://[hostname]branches/1.0
svn merge -r 1234:HEAD --dry-run http://[hostname]/branches/1.0
svn merge -r 1234:HEAD http://[hostname]/branches/1.0
svn ci

Merging changes from the trunk to the branch
Assume that the current directory is where the branch code was checked out.

svn diff -r 1234:HEAD http://[hostname]/trunk
svn merge -r 1234:HEAD --dry-run http://[hostname]/trunk
svn merge -r 1234:HEAD http://[hostname]/trunk
svn ci

Viewing SVN externals

svn propset svn:externals .

Editing SVN externals

svn propedit svn:externals .

Viewing who modified the file

svn blame whosefault.txt

Getting Started with GDB

GDB is a very powerful debugging tool for C/C++ and many other languages. Here I'm gonna show you how to get started with GDB.

testgdb.cpp

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

#include <iostream> #include <string> using namespace std;    string globalmsg = "Hello World";    void half(int& a) {     a /= 2; }    int whatever() {     int i = 5;     i *= 3;     return i; }    int main() {     int a = 10;     half(a);     cout << a << endl;     cout << whatever() << endl;     return 0; }

1. Compile the code

g++ -c -g -Wall -O0 testgdb.cpp

The -O0 flag is useful for debugging information because the compiler may do its own optimization that can eliminate some debugging information, such as -O2 flag for example.
2. Link it

g++ -o testgdb testgdb.o

3. Run it

gdb ./testgdb

After running this statement, there will be gdb prompt.
4. Set the breakpoint in line 18 and 19

break testgdb.cpp:18

break testgdb.cpp:19

5. See the list of breakpoints

info break

6. Remove the second breakpoint

delete 2

7. Run the program

run

8. See the current line

list

9. Step over to the next line

next

10. See the current line again

list

11. Step in to the half() function

step

12. Print the arguments

info args

13. Go to the next line

next

14. Print the value a now

print a

The new value should be 5.
15. Step out from half() function

finish

16. Print all the local variables

info locals

17. Set another breakpoint in line 13

break testgdb.cpp:13

18. Jump to that newly-set breakpoint

continue

19. Step over

next

20. Print the new value of i

print i

The value of i should be 15
21. Step out from the whatever() function

finish

22. Get the length of globalmessage string

print globalmessage.size()

23. Quit gdb

quit

I hope this brief introduction is useful. For more information, type

help <command>