### Installation of Choose Source: https://github.com/theryangeary/choose/blob/master/readme.md Provides common methods for installing the choose utility, including building from source via Cargo and using various system package managers. ```bash # Build from source git clone https://github.com/theryangeary/choose.git cd choose cargo build --release install target/release/choose # Cargo cargo install choose # Arch Linux yay -S choose-rust-git # Fedora/CentOS dnf copr enable atim/choose dnf install choose # Homebrew brew install choose-rust # MacPorts sudo port install choose ``` -------------------------------- ### Integrate choose into Unix Pipelines Source: https://context7.com/theryangeary/choose/llms.txt Provides examples of using choose within command pipelines for real-time text processing and data transformation. ```bash # Extract usernames from /etc/passwd cat /etc/passwd | choose -f ':' 0 # Process command output ps aux | choose 0 1 10 # Chain with other tools docker ps | choose 0 1 -1 | grep -v CONTAINER # Real-time log processing tail -f /var/log/access.log | choose 0 3 6 # Multiple transformations echo "path/to/some/file.txt" | choose -f '/' -1 | choose -f '.' 0 ``` -------------------------------- ### Field Selection with Choose Source: https://github.com/theryangeary/choose/blob/master/readme.md Demonstrates various ways to select fields from input text using the choose command. Examples cover basic indexing, range selection, custom separators, and exclusive/inclusive slicing. ```bash choose 5 # print the 5th item from a line (zero indexed) choose -f ':' 0 3 5 # print the 0th, 3rd, and 5th item from a line, where # items are separated by ':' instead of whitespace choose 2:5 # print everything from the 2nd to 5th item on the line, # inclusive of the 5th choose -x 2:5 # print everything from the 2nd to 5th item on the line, # exclusive of the 5th choose :3 # print the beginning of the line to the 3rd item choose -x :3 # print the beginning of the line to the 3rd item, # exclusive choose 3: # print the third item to the end of the line choose -1 # print the last item from a line choose -3:-1 # print the last three items from a line ``` -------------------------------- ### Negative Indexing and Reverse Ranges Source: https://context7.com/theryangeary/choose/llms.txt Access fields relative to the end of the line using negative indices. Reverse ranges are supported by specifying a start index greater than the end index. ```bash # Get the last field echo "apple banana cherry date" | choose -1 # Get the last three fields echo "a b c d e f g" | choose -3:-1 # Select fields 4 down to 2 (reverse order) echo "0 1 2 3 4 5 6 7" | choose 4:2 # Reverse entire line echo "one two three four" | choose 3:0 ``` -------------------------------- ### Range Selection with Colon and Rust Syntax Source: https://context7.com/theryangeary/choose/llms.txt Extract ranges of fields using inclusive colon syntax or Rust-style range operators. Supports partial ranges by omitting start or end bounds. ```bash # Select fields 2 through 5 (inclusive) echo "0 1 2 3 4 5 6 7 8 9" | choose 2:5 # Select from beginning to field 3 echo "apple banana cherry date elderberry" | choose :3 # Select from field 3 to end of line echo "apple banana cherry date elderberry" | choose 3: # Rust-style exclusive range echo "0 1 2 3 4 5 6 7 8 9" | choose 2..5 # Rust-style inclusive range echo "0 1 2 3 4 5 6 7 8 9" | choose 2..=5 ``` -------------------------------- ### Read Input from Files Source: https://context7.com/theryangeary/choose/llms.txt Explains how to use the -i flag to process files directly instead of reading from standard input. ```bash # Read from file and select fields choose -i /etc/passwd -f ':' 0 6 # Process log files choose -i /var/log/syslog 0 1 2 -1 # Combine with other options choose -i data.csv -f ',' -o '\t' 0 2 4 ``` -------------------------------- ### Basic Field Selection with Choose Source: https://context7.com/theryangeary/choose/llms.txt Select specific fields from whitespace-separated input using zero-based indexing. Supports single indices or multiple field selection. ```bash # Select the 5th field (zero-indexed) echo "the quick brown fox jumps over the lazy dog" | choose 5 # Select first field echo "hello world foo bar" | choose 0 # Select multiple specific fields echo "apple banana cherry date elderberry" | choose 0 2 4 ``` -------------------------------- ### Handle Non-Greedy Field Separators with choose Source: https://context7.com/theryangeary/choose/llms.txt Demonstrates how to use the -n flag to prevent the collapsing of consecutive empty fields when using custom field separators. ```bash # Without non-greedy: consecutive separators are collapsed echo "a,,b,,c" | choose -f ',' 0 1 2 3 4 # With non-greedy: empty fields preserved echo "a,,b,,c" | choose -n -f ',' 0 1 2 3 4 # Useful for CSV with empty values echo "John,,42," | choose -n -f ',' 0 1 2 3 ``` -------------------------------- ### Switch to One-Indexed Field Selection Source: https://context7.com/theryangeary/choose/llms.txt Shows how to use the --one-indexed flag to change the default zero-based field numbering to one-based numbering. ```bash # One-indexed selection (field 1 is first field) echo "apple banana cherry" | choose --one-indexed 1 # Compare zero-indexed vs one-indexed echo "a b c d e" | choose 0 echo "a b c d e" | choose --one-indexed 1 ``` -------------------------------- ### Character-wise Selection Source: https://context7.com/theryangeary/choose/llms.txt Use the -c flag to perform slicing based on character positions rather than field delimiters. ```bash # Select characters 3 through 6 echo "Hello World" | choose -c 3:6 # Last character echo "Hello" | choose -c -1 # Characters in reverse echo "abcdef" | choose -c 4:1 ``` -------------------------------- ### Interpret Exit Codes Source: https://context7.com/theryangeary/choose/llms.txt Lists the standard exit codes returned by choose to indicate success or specific failure conditions. ```bash # Exit code 0: Success echo "test" | choose 0 echo $? # Exit code 1: Failed to parse choice arguments choose d:i 2>/dev/null echo $? # Exit code 2: Invalid regex for field separator choose -f '[invalid' 0 2>/dev/null echo $? # Exit code 3: Failed to open input file choose -i /nonexistent/file 0 2>/dev/null echo $? ``` -------------------------------- ### Custom Field and Output Separators Source: https://context7.com/theryangeary/choose/llms.txt Define custom input field delimiters using Rust regex syntax with the -f flag, and customize output formatting with the -o flag. ```bash # Colon-separated fields echo "root:x:0:0:root:/root:/bin/bash" | choose -f ':' 0 5 6 # Regex separator: split on one or more digits echo "foo123bar456baz" | choose -f '[0-9]+' 0 1 2 # Output with custom separator echo "apple banana cherry" | choose 0 1 2 -o ',' ``` === COMPLETE CONTENT === This response contains all available snippets from this library. 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