UNIX gyakorló példák

comment.sh

#!/bin/bash
# display line-of-comments/loc rate of parameters
 
LOC=0
EMPTY=0
COMMENT=0
 
printf "%-40s%8s%8s%8s\n" "File name" "LOC" "Comment" "SLOC"
while [ "$1" != '' ]
do
    this_loc=$(wc -l < "$1")
    this_comment=$(awk '/\/\*/, /\*\// {c++;next}
            /\/\// {c++} END {print c}' "$1")
    this_empty=$(grep -c '^\s*$' "$1")
    this_sloc=$(($this_loc-$this_comment-$this_empty))
    printf "%-40s%8d%8d%8d\n" "$1" $this_loc $this_comment $this_sloc
    let LOC+=$this_loc
    let EMPTY+=$this_empty
    let COMMENT+=$this_comment
    shift
done
PERC=$(($COMMENT*100/($LOC+1)))
printf "%-40s%8d%8d%8d (%d%% comment)\n" "SUM" $LOC $COMMENT $(($LOC-$COMMENT-$EMPTY)) $PERC

ranges.sh

#!/bin/sh
# display numbers (one per line) as ranges
sort -n | awk '
    BEGIN     { last = "x" }
    /^[0-9]+$/ {
                if (last == "x") {
                    range = $1
                }
                else if (last + 1 != int($1)) {
                    if (range != last){
                        printf "%d-%d\n", range, last
                        range = int($1)
                    }
                    else {
                        printf "%d\n", last
                        range = int($1)
                    }
                }
                last = $1
    }
    END {
                if (range != last){
                    printf "%d-%d\n", range, last
                }
                else {
                    printf "%d\n", last
                }
    }'

scp.sh

# abort scp if no remote path given
scp () {
    for i in $*
    do case $i in
        *:*) command scp $*
            return $?
       esac
    done
    echo No remote path parameter. Aborting.
    return 1
}

tempdir.sh

# change to temp dir
t()  {
    if [ ${1:-0} -eq 0 ]
    then
        mkdir -p ~/temp/$(date -d "${1:-0} days ago" +%Y%m%d)
    fi
    cd ~/temp/$(date -d "${1:-0} days ago" +%Y%m%d)
}
# change to previous directory
p()  {
    cur=$(basename "$PWD")
    cd $(dirname "$PWD")/$(ls $(dirname "$PWD") -a |grep -EB1 "^${cur}/?$"|head -1)
}
# change to next directory
n()  {
    cur=$(basename "$PWD")
    cd $(dirname "$PWD")/$(ls $(dirname "$PWD") -a |grep -EA1 "^${cur}/?$"|tail -1)
}

trans.awk

#!/usr/bin/awk -f
# transpose a semicolon-separated-variables file
BEGIN {
    FS=";"
}
{
    a[i++] = $0
    max = max > NF ? max : NF
}
END {
    for (i = 1; i <= max; i++) {
        for (j in a) {
            $0 = a[j]
            printf "%s%s", $i, FS
        }
        print ""
    }
}

valt.sh

#!/bin/bash
# Convert $1 decimal number to base $2 [2..10]

c ()
{
    [ $1 -ge $2 ] && echo -n $(c $(expr $1 / $2) $2)
    echo -n $(expr $1 % $2)
}
 
if [ $# -ne 2 ]
then
    echo Usage: $0 NUMBER BASE
    exit 1
fi

c $1 $2
echo

xkcd.sh

#!/bin/bash
# Magyar XKCD jelszó-generátor http://xkcd.com/936/

 
DB=/var/tmp/frequent-words
CORPUS='ftp://ftp.mokk.bme.hu/Language/Hungarian/Freq/Web2.2/web2.2-freq-sorted.top100k.nofreqs.txt'
 
if [ ! -e "$DB" ]
then
    wget "$CORPUS" -O - |
    iconv -f latin2 | hunspell -G | hunspell -s |
    iconv -t ascii//TRANSLIT | tr -d ":'\"" |
    awk '$2 ~ /^[:lower:]/{print $2}' | sort -u > /var/tmp/frequent-words
fi
 
for i in $(seq ${2:-1})
do
    echo $(sort -R "$DB" | head -n ${1:-4})
done