Advanced Text Processing | sed, awk & tr | Mac/Linux Terminal

Master advanced text processing commands in Mac and Linux terminals! In this comprehensive tutorial, you'll learn powerful text manipulation tools: stream editing with `sed`, pattern scanning with `awk`, and character translation with `tr`. 🔄 **Stream Editing with sed** - `sed` command for performing text transformations on files or piped input - `sed 's/old/new/g'` for find and replace operations (global substitution) - `sed 's/old/new/'` for replacing only the first occurrence on each line - Using `sed` with files or piped input from other commands - `sed -i` to edit files in place (modifies file directly) - `sed -n` with `p` to print only matching lines - `sed '/pattern/d'` to delete lines matching a pattern - Regular expression support for pattern matching - Practical examples for batch text replacement and automated processing 📊 **Pattern Scanning with awk** - `awk` command for pattern scanning and data processing - `awk '{print $1}'` to print the first field of each line - Accessing fields with `$1`, `$2`, `$3`, etc. (`$0` for entire line) - `awk -F:` to specify field separator (colon, comma, etc.) - Performing calculations and comparisons with `awk` - Built-in variables: `NF` (number of fields), `NR` (record number), `FS` (field separator) - Filtering lines based on conditions (e.g., `awk '$2 80'`) - Formatting output and creating reports - Processing structured data like CSV files and system files 🔤 **Character Translation with tr** - `tr` command for translating, squeezing, or deleting characters - `tr 'a-z' 'A-Z'` to convert lowercase to uppercase - `tr 'A-Z' 'a-z'` to convert uppercase to lowercase - `tr -d '0-9'` to delete digits from text - `tr -s ' '` to squeeze repeated spaces into single space - `tr ' ' '\n'` to convert spaces to newlines - Character classes: `[:lower:]`, `[:upper:]`, `[:digit:]`, `[:alnum:]`, `[:alpha:]` - Working with character sets and ranges - Perfect for cleaning text data and character-level manipulation **Commands Covered:** - `sed 's/old/new/g'` - Global substitution - `sed 's/old/new/'` - First occurrence substitution - `sed -i` - Edit file in place - `sed -n 'p'` - Print matching lines - `sed '/pattern/d'` - Delete matching lines - `awk '{print $1}'` - Print first field - `awk '{print $1, $3}'` - Print multiple fields - `awk -F: '{print $1}'` - Use colon as delimiter - `awk '$2 80'` - Filter by condition - `awk '{print NR, $0}'` - Print line numbers - `tr 'a-z' 'A-Z'` - Convert to uppercase - `tr -d '0-9'` - Delete digits - `tr -s ' '` - Squeeze spaces - `tr ' ' '\n'` - Convert spaces to newlines **Perfect for:**