Commands by swarzynski

Commands by swarzynski (14)

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Add temporary <1m entries to old cron

Old cron doesn't allow periods
This is sample output - yours may be different.
1

for i in $( seq 0 5 55 ); do (crontab -l ; echo "* * * * * sleep $i; date >> ~/log.txt") | crontab -; done

swarzynski · 2022-04-04 09:56:40 59
Convert records in columns to csv
This is sample output - yours may be different.
2

awk '{print $3,$2,$1}' RS="\n\n" FS="\n" OFS="," filename.txt

swarzynski · 2022-03-08 17:58:32 88
Remove metadata from pdf file (e.g. creation date)
This is sample output - yours may be different.
-1

qpdf --pages source.pdf 1-z -- --empty clean-file.pdf

swarzynski · 2022-01-12 08:10:32 112
Change dates/timestamps of all files in the current folder
This is sample output - yours may be different.
-2

gci -rec | %{ $_.lastWriteTime = ($_.lastAccessTime = ($_.creationTime = (get-date "2021-05-19T10:14:00"))) }

swarzynski · 2022-01-12 08:08:40 146
Find non-ASCII and UTF-8 files in the current directory
This is sample output - yours may be different.
1

find . -type f -regex '.*\.$cpp\|h$' -exec file {} + | grep "UTF-8\|extended-ASCII"

swarzynski · 2020-09-15 09:10:02 143
Replace lines in files with only spaces/tabs with simple empty line (within current directory - recursive)
This is sample output - yours may be different.
0

find . -type f -regex '.*\.$cpp\|h$' -exec sed -i 's/^[[:blank:]]\+$//g' {} +

swarzynski · 2020-09-15 09:07:08 79
Make mirror of ftp directory
This is sample output - yours may be different.
1

wget -m --ftp-user=root --ftp-password=pass -A "*.csv" -nd -P "dirname" ftp://46.46.46.46/../mnt/sd/

swarzynski · 2016-08-31 10:59:07 1743
Resize all images in folder
This is sample output - yours may be different.
0

mogrify -resize 25% *.jpg

swarzynski · 2016-06-10 18:14:08 2
Check syntax of remote ruby file
This is sample output - yours may be different.
1

wget --quiet 'https://raw.githubusercontent.com/rahult/books/master/well_grounded_rubyist/threads/rps.rb' - | ruby -c

swarzynski · 2016-02-18 11:14:55 3
Copy all files in subfolders to one folder
This is sample output - yours may be different.
0

find . -type f -exec cp '{}' /path/to/all/folder \;

swarzynski · 2015-12-17 18:04:40 2
Search for files with non-Unix line endings
This is sample output - yours may be different.
0

egrep -l $'\r'\$ *

swarzynski · 2015-11-19 10:57:47 2
Run 'tail' on selected files in current directory
This is sample output - yours may be different.
0

for i in *.csv; do tail $i; done

swarzynski · 2015-11-19 10:07:59 2
Merge files in current directory
This is sample output - yours may be different.
0

find . -type f -name '*.csv' -exec cat {} + >> merged.csv

swarzynski · 2015-11-19 10:06:21 2
Rename selected files in the directory using ruby
This is sample output - yours may be different.
0

ruby -e 'Dir.glob("*.txt") { |f| File.rename(f,f.gsub("_t","")) }'

swarzynski · 2015-11-19 09:59:47 5

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Find usb device

I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

count of files from each subfolder

Find the number of files from each folder

Convert JSON to YAML

Requires installing json2yaml via npm: npm install -g json2yaml (can also pipe from stdin) Ref: https://www.npmjs.com/package/json2yaml

Formatted list - WWNs of all LUNs

Use `scsi_id` to positively identify which LUNs are which (i.e. compare with the list of LUNs you created on your disk array) (shown: RHEL5 usage) Debian usage: $ # for i in /dev/sd* ; do wwn=`/lib/udev/scsi_id -g --device $i` ; [ "$wwn" != "" ] && echo -e ${i##*/}'\t'$wwn ;done

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Get your external IP address ( 10 characters long )

Shortest url to a external IP-service, 10 characters.

add all files not under version control to repository

With the force options the same results can be achieved

Download files linked in a RSS feed

The difference between the original version provided and this one is that this one works rather than outputting a wget error

prints line numbers

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