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ans =
1.
-->exec('Example13.sci')
-->clear
-->flag=1
flag =
1.
-->mode(-1)
Current date is 23-Jun-2013
Welcome to the Textbook Companionship Project 2013
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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
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Example 13 : Show the method of setting a file timestamps
****************************************************************
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 atimemtime.c # to open the file emp.lst /* Program: atimemtime.c -- Sets a file time stamps to those of another file */
#include <sys/stat.h>
#include <fcntl.h>
#include <utime.h>
void quit(char *,int);
int main(int argc,char **argv) {
struct stat statbuf; /* To obtain time stamps for an existing file */
struct utimbuf timebuf; /* To set time stamps for another file */
if (lstat(argv[1], &statbuf) == -1)
quit("stat", 1);
timebuf.actime = statbuf.st_atime; /* Setting members of timebuf with */
timebuf.modtime= statbuf.st_mtime; /* values obtained from statbuf */
if (open(argv[2], O_RWR | O_CREAT, 0644) == -1)
quit("open", 2);
close(argv[2]); /* Previously used open only to create it */
if (utime(argv[2]), &timebuf) == -1) /* Sets both time stamps for file */
quit("utime", 3);
exit(0);
}
$ cc atimemtime.c $ mv a.out $HOME;cd;a.out .profile .logintime $ ls -l .logintime ; ls -lu .logintime -rw-r--r-- 1 <user> <group> 0 Jun 20 00:55 .logintime
-rw-r--r-- 1 <user> <group> 0 Jun 5 00:30 .logintime
$ 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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