|
1
score
|
Remove carriage return '\r' character in many files, without looping and intermediary files$ vi +'bufdo set ff=unix' +'bufdo %s/^M$//' +q file1 file2 file3 |
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1
score
|
Sort and remove duplicate lines in a file in one step without intermediary files$ vi +'%!sort | uniq' +wq file.txt |
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1
score
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Show files containing "foo" and "bar" and "baz"$ grep -l 'baz' $(grep -l 'bar' $(grep -lr 'foo' *) ) |
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1
score
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Find in files, recursively$ grep -rn 'nameserver' /etc 2>/dev/null |
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1
score
|
Calculate the total disk space used by a list of files or directories$ du -cshx ./a ./b |
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1
score
|
Create a compressed tar file that rsync will transfer efficiently$ GZIP='--rsyncable' tar cvzf bobsbackup.tar.gz /home/bob |
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1
score
|
Cut select pages from a pdf file and create a new file from those pages.$ ps2pdf -dFirstPage=3 -dLastPage=10 input.pdf output.pdf |
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1
score
|
View a file with line numbers$ cat -n /path/to/file | less |
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1
score
|
Print the lines of file2 that are missing in file1$ comm -23 file2 file1 |
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1
score
|
Uses 'at' to run an arbitrary command at a specified time.$ echo 'play alarmclock.wav 2>/dev/null' | at 07:30 tomorrow |
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1
score
|
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 "$MAX"|tail -1 |
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1
score
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Cut select pages from a pdf file and create a new file from those pages.$ pdftk input.pdf cat 2-4 7 9-10 output output.pdf |
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1
score
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Re-compress a gzip (.gz) file to a bzip2 (.bz2) file$ time gzip -cd file1.tar.gz 2>~/logfile.txt | pv -t -r -b -W -i 5 -B 8M | bzip2 > file1.tar.bz2 2>>~/logfile .txt |
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1
score
|
Test your hard drive speed$ time (dd if=/dev/zero of=zerofile bs=1M count=500;sync);rm zerofile |
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1
score
|
Recursively remove all empty sub-directories from a directory tree$ find . -depth -type d -empty -exec rmdir {} \; |
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1
score
|
Group count sort a log file$ A=$(FILE=/var/log/myfile.log; cat $FILE | perl -p -e 's/.*,([A-Z]+)[\:\+].*/$1/g' | sort -u | while read LINE; do grep "$LINE" $FILE | wc -l | perl -p -e 's/[^0-9]+//g'; echo -e "\t$LINE"; done;);echo "$A"|sort -nr |
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1
score
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Use ghostscript to shrink PDF files$ gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf |
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1
score
|
How to find all hard links to a file$ find /home -xdev -samefile file1 |
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1
score
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Find all the unique 4-letter words in a text$ cat ipsum.txt | perl -ne 'print map("$_\n", m/\w+/g);' | tr A-Z a-z | sort | uniq | awk 'length($1) == 4 {print}' |
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1
score
|
Concatenate two or more movie files into one using mencoder$ mencoder cd1.avi cd2.avi -o movie.avi -ovc copy -oac copy |
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1
score
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Calculate the average execution time (of short running scripts) with awk$ for i in {1..10}; do time some_script.sh; done 2>&1 | grep ^real | sed -e s/.*m// | awk '{sum += $1} END {print sum / NR}' |
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1
score
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Rotate a movie file with mencoder$ mencoder video.avi -o rotated-right.avi -oac copy -ovc lavc -vf rotate=1 |
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1
score
|
View specific column of data from a large file with long lines$ cat /tmp/log.data |colrm 1 155|colrm 60 300 |
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1
score
|
Replace a regexp pattern in many files at once$ vi +'bufdo %s/pattern/replacement/g | update' +q $(grep -rl pattern /path/to/dir) |
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-1
score
|
Delete all untagged Docker images$ docker rmi $(docker images -f "dangling=true" -q) |