Commands by swarzynski

Commands by swarzynski (10)

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Find non-ASCII and UTF-8 files in the current directory
This is sample output - yours may be different.
0

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

swarzynski · 2020-09-15 09:10:02 20
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 11
Make mirror of ftp directory
This is sample output - yours may be different.
0

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 0
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 0
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 1
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 0
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 0
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 0
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 0
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 0

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Resolve a list of domain names to IP addresses

Given a file of FQDN, this simple command resolves the IP addresses of those Useful for log files or anything else that outputs domain names.

Find inside files two different patterns in the same line and for matched files show number of matched lines

The option -print0 for find and -0 for grep help prevent issue with weird characters or spaces in filenames. Furthermore with xargs there is no limited number of arguments that find can throw.

Using ASCII Art output on MPlayer

Not so useful. Just a cool feature.

'hpc' in the box - starts a maximum of n compute commands modulo n controlled in parallel

the block of the loop is useful whenever you have huge junks of similar jobs, e.g., convert high res images to thumbnails, and make usage out of all the SMP power on your compute box without flooding the system. note: c is used as counter and the random sleep $ r=`echo $RANDOM%5 |bc`; echo "sleep $r"; sleep $r is just used as a dummy command.

Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Google text-to-speech in mp3 format

EDIT: command updated to support accented characters! Works in any of 58 google supported languages (some sound like crap, english is the best IMO). You get a mp3 file containing your query in spoken language. There is a limit of 100 characters for the "q" parameter, so be careful. The "tl" parameter contains target language.

Extract a remote tarball in the current directory without having to save it locally

FInd the 10 biggest files taking up disk space

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

list block devices

Shows all block devices in a tree with descruptions of what they are.

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