bashoneliners.com

Welcome to bashoneliners.com, a growing collection of practical and well-explained Bash one-liners, snippets, tips and tricks. We review and improve every contributed one-liner to make sure it is of high quality: useful, easy to read, follows best practices, with clear, detailed, accurate explanation. These one-liners should help you automate tasks, troubleshoot problems, whether it be in system administration, file management, networking or programming.

0

Print lines of a file that don't exist in another file, ignoring the first two fields

awk -F'|' 'NR == FNR { $1 = ""; $2 = ""; seen[$0]++ } NR != FNR { orig = $0; $1 = ""; $2 = ""; if (!seen[$0]) print orig }' first.txt second.txt

November 27, 2023bashoneliners

0

Watch a mashup of many video files

L=5; while true; do; readarray -t paths < <(find . -type f -print | shuf -n 1); for i in "${!paths[@]}"; do; path=${paths[i]}; if ffprobe -i "$path" -show_entries format=duration -v quiet -of csv="p=0" > /dev/null; then; N=$(ffprobe -i "$path" -show_entries format=duration -v quiet -of csv="p=0"); D=${N%.*}; P=$((D / 100 * 25)); R=$((1 + RANDOM % D - P * 2)); S=$((P + RANDOM % R)); W=$((R / 4)); LEN=$((1 + RANDOM % L)); mpv "$path" --start="$S" --length="$LEN" --fs &> /dev/null; W=$(bc <<< "$LEN - 0.5"); sleep "$W"; unset 'paths[i]'; fi; done; done

July 6, 2023krypniok

1

Count the total number of hours of your music collection

find . -print0 | xargs -0 -P 40 -n 1 sh -c 'ffmpeg -i "$1" 2>&1 | grep "Duration:" | cut -d " " -f 4 | sed "s/.$//" | tr "." ":"' - | awk -F ':' '{ sum1+=$1; sum2+=$2; sum3+=$3; sum4+=$4; if (sum4 > 100) { sum3+=1; sum4=0 }; if (sum3 > 60) { sum2+=1; sum3=0 }; if (sum2 > 60) { sum1+=1; sum2=0 } if (NR % 100 == 0) { printf "%.0f:%.0f:%.0f.%.0f\n", sum1, sum2, sum3, sum4 } } END { printf "%.0f:%.0f:%.0f.%.0f\n", sum1, sum2, sum3, sum4 }'

March 1, 2019pingiun

0

Organise image by portrait and landscape

mkdir "portraits"; mkdir "landscapes"; for f in ./*.jpg; do WIDTH=$(identify -format "%w" "$f")> /dev/null; HEIGHT=$(identify -format "%h" "$f")> /dev/null; if [[ "$HEIGHT" > "$WIDTH" ]]; then mv "$f" portraits/ ; else mv "$f" landscapes/ ; fi; done

August 23, 2018Jab2870

1

Find distinct file extensions in a folder

find . -type f | perl -ne 'print $1 if /\.([^.\/]+)$/' | sort -u

May 17, 2013kowalcj0

1

Log and verify files received via FTP

for i in $(cat /var/log/vsftpd.log | grep $DATE_TIME | grep UPLOAD | grep OK); do ls /FTP/HOME/$i >> /dev/null 2> \&1; if \[ $? = 0 \]; then echo "$i" >> $FILES_OK_UPLOADS.log; else  echo "$DATE ERROR: File $i not found" >> $FTP_FILES_NOTOK_$DATE_TIME.log; fi; done

July 10, 2012dark_axl

1

Faster disk imaging with dd

dd if=/dev/sda bs=$(hdparm -i /dev/sda | grep BuffSize | cut -d ' ' -f 3 | tr [:lower:] [:upper:] | tr -d BUFFSIZE=,) conv=noerror | dd of=image.dd conv=noerror

May 19, 2012austindcc

1

Calculate an h index from an EndNote export

MAX=$(NUM=1;cat author.xml |perl -p -e 's/(Times Cited)/\n$1/g'|grep "Times Cited" |perl -p -e 's/^Times Cited:([0-9]*).*$/$1/g'|sort -nr | while read LINE; do if [ $LINE -ge $NUM ]; then echo "$NUM"; fi; NUM=$[$NUM+1]; done;); echo "$MAX"|tail -1

February 4, 2012openiduser14

1

Test your hard drive speed

time (dd if=/dev/zero of=zerofile bs=1M count=500;sync);rm zerofile

February 1, 2012DAVEB