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clear
flag=1
mode(-1)
clc
printf("Example 1 : Show the method of file handling using the cat command \n")
disp("****************************************************************")
disp("Answer : ")
disp("INSTRUCTIONS : ")
printf("\nHere all instructions are preloaded in the form of a demo\nPRESS ENTER AFTER EACH COMMAND to see its RESULT\nPRESS ENTER AFTER EACH RESULT TO GO TO THE NEXT COMMAND\n")
halt('.............Press [ENTER] to continue.....')
halt("")
clc
printf("\tUNIX SHELL SIMULATOR(DEMO VERSION WITH PRELOADED COMMANDS)\n\n\n")
printf("\n# Enter the name of the file which you want to access \n\n")
nam=input('$ cat ','s')
printf("# This searches for a file named %s \n\n",nam)
if ~isfile(nam) then
flag=0
printf("\n%s : file not found \n",nam)
printf("# Create a new file named %s?\n # y : Yes \n # n : No \n",nam)
resp=input('','s')
if resp=='y' then
flag=1
printf("\n#***Enter the contents of the file %s*****\n# [Enter ^ in a newline to end and close the file]\n",nam)
printf('\n\n$ cat > %s #to create a file named %s and fill its contents\n',nam,nam)
fhdr=mopen(nam,'wt')
i=1
while %t
cont=input(string(i)+'. ','s')
if (cont=='^') then
break
end
mfprintf(fhdr,"%s\n",cont)
i=i+1
end
mclose(fhdr)
end
end
if flag==1 then
i=1
clc
printf("\n ===========> %s <============\n\n\n",nam)
fhdr=mopen(nam,'rt')
while %t
[n,a]=mfscanf(fhdr,"%c")
if meof(fhdr) then
break
end
printf("%c",a)
i=i+1
end
mclose(fhdr)
printf("\n\n%d characters present in the file.\n[hit ENTER to continue]\n",i)
halt('')
else
printf("\n\n# file %s is not found and not created also\n",nam)
end
printf("\n\n\n$ exit #To exit the current simulation terminal and return to Scilab console\n\n")
halt("........# (hit [ENTER] for result)")
//clc()
printf("\n\n\t\t\tBACK TO SCILAB CONSOLE...\nLoading initial environment')
sleep(1000)
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