Text

#!/bin/bash
# Extract specific lines or sections from a file

if [ -z "$1" ]; then
    echo "Usage: extract.sh <file> --lines <start>-<end>" >&2
    echo "       extract.sh <file> --between <start_pattern> <end_pattern>" >&2
    exit 1
fi

FILE="$1"
shift

if [ ! -f "$FILE" ]; then
    echo "Error: File not found: $FILE" >&2
    exit 1
fi

case "$1" in
    --lines|-l)
        RANGE="$2"
        START=$(echo "$RANGE" | cut -d'-' -f1)
        END=$(echo "$RANGE" | cut -d'-' -f2)
        sed -n "${START},${END}p" "$FILE"
        ;;
    --between|-b)
        START_PAT="$2"
        END_PAT="$3"
        sed -n "/${START_PAT}/,/${END_PAT}/p" "$FILE"
        ;;
    *)
        echo "Unknown option: $1" >&2
        echo "Use --lines or --between" >&2
        exit 1
        ;;
esac

#!/bin/bash
# Search for patterns in text files

if [ -z "$1" ] || [ -z "$2" ]; then
    echo "Usage: search.sh <file> <pattern> [--count] [--context <lines>]" >&2
    exit 1
fi

FILE="$1"
PATTERN="$2"
shift 2

COUNT_ONLY=false
CONTEXT=0

while [ $# -gt 0 ]; do
    case "$1" in
        --count|-c)
            COUNT_ONLY=true
            ;;
        --context|-C)
            CONTEXT="$2"
            shift
            ;;
    esac
    shift
done

if [ ! -f "$FILE" ]; then
    echo "Error: File not found: $FILE" >&2
    exit 1
fi

if [ "$COUNT_ONLY" = true ]; then
    MATCHES=$(grep -c "$PATTERN" "$FILE")
    echo "Matches found: $MATCHES"
elif [ "$CONTEXT" -gt 0 ]; then
    grep -n -C "$CONTEXT" "$PATTERN" "$FILE"
else
    grep -n "$PATTERN" "$FILE"
fi

#!/bin/bash
# Get statistics about a text file

if [ -z "$1" ]; then
    echo "Usage: stats.sh <file>" >&2
    exit 1
fi

FILE="$1"

if [ ! -f "$FILE" ]; then
    echo "Error: File not found: $FILE" >&2
    exit 1
fi

echo "=== Text Statistics: $FILE ==="
echo ""

LINES=$(wc -l < "$FILE" | tr -d ' ')
WORDS=$(wc -w < "$FILE" | tr -d ' ')
CHARS=$(wc -c < "$FILE" | tr -d ' ')

echo "Lines: $LINES"
echo "Words: $WORDS"
echo "Characters: $CHARS"

echo ""
echo "=== First 5 lines ==="
head -5 "$FILE"

echo ""
echo "=== Last 5 lines ==="
tail -5 "$FILE"

#!/bin/bash
# Count word frequencies in a text file

if [ -z "$1" ]; then
    echo "Usage: wordfreq.sh <file> [--top <n>]" >&2
    exit 1
fi

FILE="$1"
TOP=0
shift

while [ $# -gt 0 ]; do
    case "$1" in
        --top|-t)
            TOP="$2"
            shift
            ;;
    esac
    shift
done

if [ ! -f "$FILE" ]; then
    echo "Error: File not found: $FILE" >&2
    exit 1
fi

# Convert to lowercase, split into words, count and sort
RESULT=$(tr '[:upper:]' '[:lower:]' < "$FILE" | \
    tr -cs '[:alpha:]' '\n' | \
    grep -v '^$' | \
    sort | \
    uniq -c | \
    sort -rn)

if [ "$TOP" -gt 0 ]; then
    echo "$RESULT" | head -"$TOP"
else
    echo "$RESULT"
fi