Glasgow | 26-SDC-July | Mansoor Munawar| Sprint 4 | Implement shell tools (cat, ls, wc) in Python

implement-shell-tools-python-mansoor/1.txt

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+Hello world, Hi, ETC

implement-shell-tools-python-mansoor/cat/cat.py

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+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="cat",
+    description="Concatenate and display files",
+)
+
+parser.add_argument(
+    "-n",
+    action="store_true",
+    help="number all lines",
+)
+
+parser.add_argument(
+    "-b",
+    action="store_true",
+    help="number non-empty lines",
+)
+
+parser.add_argument(
+    "files",
+    nargs="+",
+    help="the files to read",
+)
+
+args = parser.parse_args()
+
+line_number = 1
+
+for filename in args.files:
+    try:
+        with open(filename) as file:
+            for line in file:
+                content = line.rstrip("\n")
+
+                if args.b and content == "":
+                    print()
+                    continue
+
+                if args.n or args.b: 
+                    print(f"{line_number}\t{content}")
+                    line_number +=1 
+                else: 
+                    print(content)
+
+    except OSError as error:
+        print(f"{error.strerror}")

implement-shell-tools-python-mansoor/ls/ls.py

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+import argparse
+import os
+
+parser = argparse.ArgumentParser(
+    prog = "ls",
+    description = "List directory content"
+)
+
+parser.add_argument(
+    "paths",
+    nargs = "*",
+    default=["."],
+    help= "the directory path to process",
+)
+
+parser.add_argument(
+    "-1",
+    "--one",
+    action="store_true",
+    help="list one file per line",
+
+)
+
+parser.add_argument(
+    "-a",
+    "--all",
+    action="store_true",
+    help="List all files including hidden files such as '.' and  '..' "
+)
+
+args = parser.parse_args()
+
+for target_dir in args.paths:
+    try:
+        files = os.listdir(target_dir)
+
+        if args.all:
+            file_list = sorted([".", ".."] + files)
+        else:
+            file_list = []
+            for name in files:
+                if not name.startswith("."):
+                    file_list.append(name)
+            file_list.sort()
+
+        if args.one: 
+            for name in file_list:
+                print(name)
+        else: 
+            print(" ".join(file_list))
+    except OSError as error:
+        print(f"{error.strerror}")

implement-shell-tools-python-mansoor/wc/wc.py

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+import argparse
+
+parser = argparse.ArgumentParser(
+    prog ="wc",
+    description ="my word, line and byte count",
+)
+
+parser.add_argument(
+    "-l",
+    "--lines",
+    action="store_true",
+    help="count lines"
+)
+
+parser.add_argument(
+    "-w",
+    "--words",
+    action="store_true",
+    help="count words",
+)
+
+parser.add_argument(
+    "-c",
+    "--bytes",
+    action ="store_true",
+    help="count bytes",
+)
+
+parser.add_argument(
+    "files",
+    nargs="+",
+    help=" the files to process",
+)
+
+args = parser.parse_args()
+
+if not args.lines and not args.words and not args.bytes:
+    show_line = True
+    show_words = True
+    show_bytes = True
+else:
+    show_line = args.lines
+    show_words = args.words
+    show_bytes = args.bytes
+
+total_lines = 0
+total_words = 0
+total_bytes = 0
+
+
+for filename in args.files:
+    try:
+        with open(filename, "rb") as f:
+            content = f.read()
+
+        lines = content.count(b"\n")
+        words = len(content.split())
+        bytes_count = len(content)
+
+        total_lines += lines
+        total_words += words
+        total_bytes += bytes_count
+
+        output = []
+        if show_line:
+            output.append(str(lines))
+        if show_words:
+            output.append(str(words))
+        if show_bytes:
+            output.append(str(bytes_count))
+        output.append(filename)
+        print("\t".join(output))
+
+    except OSError as error:
+        print(f"{error.strerror}")
+
+if len(args.files) > 1:
+    total_output = []
+    if show_line:
+        total_output.append(str(total_lines))
+    if show_words:
+        total_output.append(str(total_words))
+    if show_bytes:
+        total_output.append(str(total_bytes))
+    total_output.append("total")
+    print("\t".join(total_output))