Glasgow | 25-SDC-July | Sheetal Kharab | Sprint 4 | implement-shell tools in python

implement-shell-tools/cat/cat.py

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+import argparse
+import os
+
+# set argument parser
+parser = argparse.ArgumentParser(description="Python implementation of cat command")
+
+# to number all lines
+parser.add_argument("-n", action="store_true", help="Number all lines")
+
+# to number non-blank lines
+parser.add_argument("-b", action="store_true", help="Number non-blank lines (overrides -n)")
+
+# To raed files
+parser.add_argument("files", nargs="+", help="Files to read")
+
+args = parser.parse_args()
+
+if args.n and args.b:
+    args.n = False
+
+line_number = 1
+
+for file in args.files:
+    if not os.path.isfile(file):
+        print(f"cat: {file}: No such file or directory")
+        continue
+
+
+    with open(file, "r") as f:
+        for line in f:
+            if args.b:
+                if line.strip():      #to number non blank lines only
+                    print(f"{line_number:6}\t{line}", end="")
+                    line_number += 1
+                else:
+                    print(line, end="") # to print blank line with number
+
+            elif args.n:
+                print(f"{line_number:6}\t{line}", end="")  # to print number all lines
+                line_number += 1
+            else:    
+                print(line, end ="")  # to print content of files

implement-shell-tools/ls/ls.py

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+import argparse
+import os
+
+parser = argparse.ArgumentParser(description="dispaly one file per line from ls directory")
+
+parser.add_argument("-1", action="store_true", help="List one file per line")
+parser.add_argument("-a", action="store_true", help="Include hidden files (those starting with .)")
+parser.add_argument("path", nargs="?", default=".", help="The directory to list (default: current directory)")
+
+args = parser.parse_args()
+
+for filename in sorted(os.listdir(args.path)):
+    if not args.a and filename.startswith("."):
+        # skip hidden files unless -a is provided
+        continue 
+    print(filename)

implement-shell-tools/wc/wc.py

@@ -0,0 +1,62 @@
+import argparse
+import os
+
+parser = argparse.ArgumentParser(description="Python implementation of wc command")
+
+parser.add_argument("-l", action="store_true", help="Print line count")
+
+parser.add_argument("-w", action="store_true", help="Print word count")
+
+parser.add_argument("-c", action="store_true", help="Print byte count")
+
+parser.add_argument("files", nargs="+", help="Files to process")
+
+args = parser.parse_args()
+
+total_lines = 0
+total_words = 0
+total_bytes = 0
+
+multiple_files = len(args.files) > 1 # to store totals if muliple files
+
+# Helper function to print counts in wc style
+def print_counts(lines, words, bytes_, filename):
+    output = []
+    if args.l:
+        output.append(str(lines))
+    if args.w:
+        output.append(str(words))
+    if args.c:
+        output.append(str(bytes_))
+
+    # If no flags are given, print all three counts
+    if not output:
+        output = [f"{lines:>7}", f"{words:>7}", f"{bytes_:>7}"]
+
+    print(" ".join(output), filename)
+
+for file in args.files:
+    if not os.path.isfile(file):
+        print(f"wc: {file}: No such file or directory")
+        continue
+
+    with open(file, "r", encoding="utf-8") as f:
+        content = f.read()
+        lines = content.count("\n")
+        words = len(content.split())
+        tbytes = os.path.getsize(file)
+
+
+        total_lines += lines
+        total_words += words
+        total_bytes += tbytes
+
+        # Print counts per file
+        print_counts(lines, words, tbytes, file)
+
+#to print total output
+if multiple_files:
+    print_counts(total_lines, total_words, total_bytes, "total")   
+
+
+