Manchester | 26-SDC-Jul | Fithi Teklom | Sprint 4 | Implement shell tools in Python

implement-shell-tools/cat/cat.py

@@ -0,0 +1,21 @@
+import sys
+
+if sys.argv[1] == "-n" or sys.argv[1] == "-b":
+   filenames = sys.argv[2:]
+else:
+   filenames = sys.argv[1:]
+line_number = 1
+for filename in filenames:
+    file = open(filename)
+    for line in file:
+        if sys.argv[1] == "-n":
+           print(line_number, line, end = "")
+           line_number += 1
+        elif sys.argv[1]== "-b":
+            if line.strip() != "":
+                print(line_number, line, end = "")
+                line_number += 1
+            else:
+                print(line, end="")    
+        else:
+           print(line, end = "")    

implement-shell-tools/ls/ls.py

@@ -0,0 +1,42 @@
+import sys
+import os
+
+show_all = "-a" in sys.argv
+one_per_line = "-1" in sys.argv
+
+paths = []
+
+for argument in sys.argv[1:]:
+    if not argument.startswith("-"):
+        paths.append(argument)
+
+if not paths:
+    paths.append(".")
+
+for path in paths:
+    if os.path.isfile(path):
+        if len(paths) == 1 or one_per_line:
+            print(path)
+        else:
+            print(path, end = ("  "))
+    else:
+        if len(paths) > 1:
+            print()
+            print()
+            print(path + ":")
+
+        files = sorted(os.listdir(path))
+
+        if show_all:
+            files = ["."] + [".."] + files
+
+        for file in files:
+            if show_all or not file.startswith("."):
+                if one_per_line:
+                    print(file)
+                else:
+                    print(file, end=("  ")) 
+        if not one_per_line:
+            print()
+
+

implement-shell-tools/wc/wc.py

@@ -0,0 +1,67 @@
+import sys
+import os
+
+count_lines = "-l" in sys.argv
+count_words = "-w" in sys.argv
+count_bytes = "-c" in sys.argv
+
+filenames = []
+
+for argument in sys.argv[1:]:
+    if not argument.startswith("-"):
+        filenames.append(argument)
+
+def format_counts(line_count, word_count, byte_count):
+    output = []
+
+    if count_lines:
+        output.append(line_count)
+
+    if count_words:
+        output.append(word_count)
+
+    if count_bytes:
+        output.append(byte_count)
+
+    if not count_lines and not count_words and not count_bytes:
+        output.append(line_count)
+        output.append(word_count)
+        output.append(byte_count)
+
+    formatted_output = []
+
+    for number in output:
+        formatted_output.append(f"{number:3}")
+
+    return " ".join(formatted_output)
+
+total_lines = 0
+total_words = 0
+total_bytes = 0
+
+for filename in filenames:
+    file = open(filename)
+
+    line_count = 0
+    word_count = 0
+
+    for line in file:
+        line_count += 1
+        word_count += len(line.split())
+
+    byte_count = os.path.getsize(filename)
+
+    total_lines += line_count
+    total_words += word_count
+    total_bytes += byte_count
+
+    print(
+        format_counts(line_count, word_count, byte_count),
+        filename,
+    )
+
+if len(filenames) > 1:
+    print(
+        format_counts(total_lines, total_words, total_bytes),
+        "total",
+    )