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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1088/CH23/EX23.2/Result2.txt | |
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initial commit / add all books
Diffstat (limited to '1088/CH23/EX23.2/Result2.txt')
| -rwxr-xr-x | 1088/CH23/EX23.2/Result2.txt | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/1088/CH23/EX23.2/Result2.txt b/1088/CH23/EX23.2/Result2.txt new file mode 100755 index 000000000..4378e7744 --- /dev/null +++ b/1088/CH23/EX23.2/Result2.txt @@ -0,0 +1,161 @@ + ans =
+
+ 1.
+
+-->exec('Example2.sci')
+
+-->clear
+
+-->flag=1
+ flag =
+
+ 1.
+
+-->mode(-1)
+Current date is 23-Jun-2013
+
+Welcome to the Textbook Companionship Project 2013
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Book Title : UNIX CONCEPTS AND APPLICATIONS
+
+ Book Edition : 4
+
+ Book Author : Sumitabha Das
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Code Author : Pranav Bhat T
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Chapter Number : 23
+
+ Chapter Title : Systems programming I- Files
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+Example 2 : Show the method of reversing a file using lseek
+
+ ****************************************************************
+
+ Answer :
+
+ INSTRUCTIONS :
+
+ 1.These programs are part of systems programming in Unix and the commands have NO EQUIVALENT IN SCILAB
+
+ 2.However if possible some selected programmes have been TRIED TO BE IMPLEMENTED
+
+ 3.For most of the programmes whose equivalent is NOT THERE IN SCILAB,only the output has been printed as given in the textbook w
+ ith no interactive input as in the programme below
+
+ 4.However the .c files which are displayed here are also made into a seperate file.If you are a unix user then try compiling and
+ running the programme with gcc or cc compiler
+
+ 5.The inconvenience is regretted.
+.............Press [ENTER] to continue..... UNIX SHELL SIMULATOR(DEMO VERSION WITH PRELOADED COMMANDS)
+
+
+
+
+$ cat reverse_read.c # to open the file emp.lst /* Program: reverse_read.c -- Reads a file in reverse - uses lseek */
+
+#include <fcntl.h> /* For O_RONLY */
+#include <unistd.h> /* For STDOUT_FILENO */
+
+int main(int argc, char **argv) {
+ char buf; /* Single-character buffer; will make */
+ int size, fd; /* I/O inefficient. See Section 23.4 */
+
+ fd= open(argv[1], O_RDONLY);
+ size = lseek(fd, -1, SEEK_END); /* Pointer taken to EOF - 1 ... */
+ while (size-- >= 0) { /* ... so siz = file size - 1 */
+ read(fd, &buf, 1); /* Read one character at a time */
+ write(STD_FILENO, &buf, 1); /* and write it immediately */
+ lseek(fd, -2, SEEK_CUR); /* Now move the file pointer back */
+ } /* by two characters */
+ /* exit(0); */ /* done deliberately */
+}
+
+$ ls
+ ans =
+
+!vv.txt !
+! !
+!reverse_read.c !
+! !
+!Result2.txt !
+! !
+!Example9.sci !
+! !
+!Example8.sci !
+! !
+!Example7.sci !
+! !
+!Example6.sci !
+! !
+!Example5.sci !
+! !
+!Example4.sci !
+! !
+!Example3.sci !
+! !
+!Example2.sci !
+! !
+!Example13.sci !
+! !
+!Example12.sci !
+! !
+!Example11.sci !
+! !
+!Example10.sci !
+! !
+!ex9 !
+! !
+!ex8 !
+! !
+!ex7 !
+! !
+!ex6 !
+! !
+!ex5 !
+! !
+!ex4 !
+! !
+!ex3 !
+! !
+!ex2 !
+! !
+!ex13 !
+! !
+!ex12 !
+! !
+!ex11 !
+! !
+!ex10 !
+! !
+!ex1 !
+
+$ cat vv.txt Warning: file 'vv.txt' already opened in Scilab.
+hi there
+How are you
+I am fine
+Thank You
+Good Bye
+$ cc reverse_read.c$ a.out vv.txt
+......a blank line... The terminating \n of the last lineWarning: file 'vv.txt' already opened in Scilab.
+eyB dooG
+
+uoY knahT
+
+ enif ma I
+
+uoy era woH
+
+ereht i
+
+
+$ exit #To exit the current simulation terminal and return to Scilab console
+
+........# (hit [ENTER] for result)
+
+ BACK TO SCILAB CONSOLE...
+Loading initial environment
+-->diary(0)
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