Merge pull request #1 from arora-ansh/newbranch

Added new files

Makefile

@@ -0,0 +1,17 @@
+run:
+	gcc ls.c -o ls
+	gcc cat.c -o cat
+	gcc date.c -o date
+	gcc mkdir.c -o mkdir
+	gcc rm.c -o rm
+	gcc main.c
+	clear
+	./a.out
+
+clear:
+	rm ls
+	rm a.out
+	rm cat
+	rm date
+	rm mkdir
+	rm rm

cat.c

@@ -0,0 +1,73 @@
+//cat command
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <zconf.h>
+
+int main(int argc, char **args){
+    if(argc==3) {
+        chdir("/");
+        chdir(*(args+2));
+        char *line = NULL;
+        FILE *fptr;
+        size_t len = 0;
+        if ((fptr = fopen(*(args + 1), "r")) == NULL) {
+            printf("No such file or directory\n");
+            // Program exits if file pointer returns NULL.
+            exit(1);
+        }
+
+        // reads text until newline is encountered
+        while (getline(&line, &len, fptr) != -1) {
+            printf("%s", line);
+        }
+        fclose(fptr);
+    }
+    else if(argc==4){
+        if(strcmp(*(args+1),"-n")==0){
+            chdir("/");
+            chdir(*(args+3));
+            char *line = NULL;
+            FILE *fptr;
+            size_t len = 0;
+            if ((fptr = fopen(*(args + 2), "r")) == NULL) {
+                printf("No such file or directory\n");
+                // Program exits if file pointer returns NULL.
+                exit(1);
+            }
+
+            // reads text until newline is encountered
+            int i = 1;
+            while (getline(&line, &len, fptr) != -1) {
+                printf("%d %s", i, line);
+                i++;
+            }
+            fclose(fptr);
+        }
+        else if(strcmp(*(args+1),"-e")==0){
+            chdir("/");
+            chdir(*(args+3));
+            char *line = NULL;
+            FILE *fptr;
+            size_t len = 0;
+            if ((fptr = fopen(*(args + 2), "r")) == NULL) {
+                printf("No such file or directory\n");
+                // Program exits if file pointer returns NULL.
+                exit(1);
+            }
+
+            // reads text until newline is encountered
+            while (getline(&line, &len, fptr) != -1) {
+                printf("%s$", line);
+            }
+            fclose(fptr);
+
+        }
+        else{
+            printf("Invalid Command, argument required\n");
+        }
+    }
+    exit(0);
+}
+

date.c

@@ -0,0 +1,99 @@
+//date command
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+
+int main(int argc,char **args)
+{
+    time_t t = time(NULL);
+    struct tm tm;
+    if(argc==1 || (strcmp(*(args+1),"-R")==0)){
+        tm = *localtime(&t);
+    }
+    else{
+        if(strcmp(*(args+1),"-u")==0){
+            tm = *gmtime(&t);
+        }
+        else{
+            printf("Invalid Command, argument required\n");
+            exit(0);
+        }
+    }
+
+    char month[5];
+    char weekday[5];
+    if(tm.tm_mon+1==1){
+        strcpy(month,"Jan");
+    }
+    if(tm.tm_mon+1==2){
+        strcpy(month,"Feb");
+    }
+    if(tm.tm_mon+1==3){
+        strcpy(month,"Mar");
+    }
+    if(tm.tm_mon+1==4){
+        strcpy(month,"Apr");
+    }
+    if(tm.tm_mon+1==5){
+        strcpy(month,"May");
+    }
+    if(tm.tm_mon+1==6){
+        strcpy(month,"Jun");
+    }
+    if(tm.tm_mon+1==7){
+        strcpy(month,"Jul");
+    }
+    if(tm.tm_mon+1==8){
+        strcpy(month,"Aug");
+    }
+    if(tm.tm_mon+1==9){
+        strcpy(month,"Sep");
+    }
+    if(tm.tm_mon+1==10){
+        strcpy(month,"Oct");
+    }
+    if(tm.tm_mon+1==11){
+        strcpy(month,"Nov");
+    }
+    if(tm.tm_mon+1==12){
+        strcpy(month,"Dec");
+    }
+    if(tm.tm_wday+1==2){
+        strcpy(weekday,"Mon");
+    }
+    if(tm.tm_wday+1==3){
+        strcpy(weekday,"Tue");
+    }
+    if(tm.tm_wday+1==4){
+        strcpy(weekday,"Wed");
+    }
+    if(tm.tm_wday+1==5){
+        strcpy(weekday,"Thu");
+    }
+    if(tm.tm_wday+1==6){
+        strcpy(weekday,"Fri");
+    }
+    if(tm.tm_wday+1==7){
+        strcpy(weekday,"Sat");
+    }
+    if(tm.tm_wday+1==1){
+        strcpy(weekday,"Sun");
+    }
+
+    if(argc==1 || (argc==2 && (strcmp(*(args+1),"-R")==0))) {
+        if(argc==1){
+            printf("%s %s %d %02d:%02d:%02d IST %d\n", weekday, month, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec,
+               tm.tm_year + 1900);
+        }
+        else{
+            printf("%s, %d %s %d %02d:%02d:%02d +0530 \n", weekday, tm.tm_mday, month, tm.tm_year + 1900, tm.tm_hour, tm.tm_min, tm.tm_sec);
+        }
+    }
+    else{
+        printf("%s %s %d %02d:%02d:%02d UTC %d\n", weekday, month, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec,
+               tm.tm_year + 1900);
+    }
+    exit(0);
+}

docs/cat.txt

@@ -0,0 +1,6 @@
+cat: cat [OPTIONS] [ARGS]
+    Displays the files line by line asked for in the ARGs.
+
+    Flags - 
+        -n      Numbers the lines starting from 1
+        -e      Marks the end of a line using the $ sign

docs/cd.txt

@@ -0,0 +1,13 @@
+cd: cd [OPTION] [DIR]
+    Changes the current directory to given directory, displays an error 
+    if given directory does not exist.
+
+    Flags-
+        -P          Instructs the shell to use the physical directory structure instead
+                    of following symbolic links
+        --help      Displays this help page
+
+    Special Arguments-
+        ..          Takes to the directory prior to current directory
+        /           Takes to the root directory of the system (if access rights passed)
+        ~           Takes to the home directory of the system

docs/date.txt

@@ -0,0 +1,6 @@
+date: date [OPTIONS]
+    Displays the present date and time.
+
+    Flags -
+        -u      Displays the present date and time according to UTC.
+        -R      Use RFC 2822 date and time output format.

docs/echo.txt

@@ -0,0 +1,7 @@
+echo: echo [-neE] [arg ...]
+
+    Output the ARGs.  If -n is specified, the trailing newline is
+    suppressed.
+
+    Flags -
+        -n      Doesn't call a new line after outputting the ARGs.

docs/exit.txt

@@ -0,0 +1,2 @@
+exit: exit 
+    Exits the shell.

docs/historyhelp.txt

@@ -0,0 +1,7 @@
+history: history [-c] [-d offset] 
+    Display the history list with line numbers.
+
+    Flags -
+        -c          Clears the previously saved history and then displays the list.
+        -d offset   Removes the entry from history with the given offset and 
+                    displays the list.

docs/ls.txt

@@ -0,0 +1,7 @@
+ls: ls [OPTIONS]
+    Displays the contents of the current directory. 
+
+    Flags - 
+        -A      Shows all contents of the directory except . and ..
+        -m      Shows all contents of the directory as seperated by commas 
+                instead of different lines.

docs/mkdir.txt

@@ -0,0 +1,12 @@
+mkdir: mkdir [OPTIONS] [ARGS]
+    Makes a directory having the name given in ARGs and default access mode
+    0777 (rwxrwxrwx).
+
+    Flags -
+        -v      Informs the user wheter a directory was created, shows an error
+                if it was unable to.
+        -p      Create intermediate directories as required.  If this option is
+                not specified, the full path prefix of each operand must already
+                exist.  On the other hand, with this option specified, no error
+                will be reported if a directory given as an operand already
+                exists.

docs/pwd.txt

@@ -0,0 +1,8 @@
+pwd: pwd [-LP]
+    Print the current working directory.  With the -P option, pwd prints
+    the physical directory, without any symbolic links; the -L option
+    makes pwd follow symbolic links.
+
+    Flags - 
+        -L          Makes pwd show the symbolic positioning of current directory
+        -P          Makes pwd print the current directory's physical positioning

docs/rm.txt

@@ -0,0 +1,6 @@
+rm: rm [OPTIONS] [ARGS]
+    Deletes the files held in ARGs.
+
+    Flags - 
+        -i      Asks for the user's permission before deleting a file.
+        -v      Informs the user of the file that is being deleted (verbose).

history.txt

@@ -0,0 +1,111 @@
+history
+help pwd
+exit
+pwd 
+pwd -L
+pwd -P
+pwd --help
+cd ..
+cd A1Shell
+cd ~
+cd /
+cdcd ~
+cd ~
+exit
+cd ..
+cd ..
+cd CSE231_OS
+cd -P
+cd -P A1Shell
+exit
+cd ..
+cd ..
+cd ..
+cd Documents
+cd -P c
+cd ..
+cd ..
+cd -P Desktop/CSE231_OS/A1Shell
+cd --help
+cd --help
+help cd
+exit
+help ls
+ls
+ls -A
+ls -m
+help time
+hehelp date
+help date
+date 
+date -u
+date -R
+cat Makefile
+cat -n Makefile
+cat -e Makefile
+cd ~
+cd ..
+cd ..
+cd..
+cd ..
+exit
+cd ~
+cd Documents/c
+ls
+rm hello.i
+rm -v hello.i
+rm -v hello.s
+rm -i txtfile.txt
+exit
+mkdir abc
+cd abc
+pwd
+cd ..
+mkdir -v fgh
+cd fgh
+pwd
+cd ..
+cd ..
+exit
+cd ..
+cd ~
+cd ..
+mkdir -v abc
+mkdir -v abcd
+cd abcd
+pwd
+mkdir -p ab/bc/cd
+ls
+cd ab/bc/cd
+pwd
+ls
+cd ~
+cd //
+cd /
+cd ..
+cd ..
+cd ..
+cd ..
+echo -l
+exit
+cd ..
+../..
+cd ../..
+cd ~
+cd
+cd
+cd ~
+cd
+cd
+cd ..
+cd /
+exit
+help cd
+help history
+history
+cd ..
+date
+pwd
+date -u
+rm a.out
+exit