Commands by moogmusic

Commands by moogmusic (6)

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Delete Last Line of a File if it is Blank

Use sed to remove the last line of a file only if it is empty.
This is sample output - yours may be different.
4

sed '${/^$/d}' file

moogmusic · 2012-01-25 14:07:55 9
Rebuild a Delimited File with a Unique Delimiter

Useful for CSV files. In the command, the file in question is comma delimited but contains double quoted fields containing commas and contains no @ symbols (as confirmed with http://www.commandlinefu.com/commands/view/9998/delimiter-hunting). This command converts the delimiting commas to @s while preserving the commas in the fields using the "uniqueString" to mark the ends of lines.
This is sample output - yours may be different.
1

sed 's/$/uniqueString/' file.old | sed 's/,/\n/g' | sed ':loop;/^\"[^\"]*$/N;s/\n/,/;/[^\"]$/t loop' | sed ':loop;N;s/\n/@/g;/uniqueString$/!b loop;s/uniqueString$//' > file.new

moogmusic · 2012-01-06 10:06:40 4
Delimiter Hunting

Scan a file and print out a list of ASCII characters that are not used in the file which can then be safely used to delimit fields. Useful when needing to convert CSV files using "," to a single character delimiter. Piping it into less at the end (which could be redundant) stops the command characters being interpreted by the terminal.
This is sample output - yours may be different.
0

for i in `seq 0 9` A B C D E F; do for j in `seq 0 9` A B C D E F; do HEX=\$\'\\x${i}${j}\'; if ! eval grep -qF "$HEX" file; then eval echo $HEX \\x${i}${j}; fi; done; done 2> /dev/null | less

moogmusic · 2012-01-05 10:09:07 49
Find/Replace in a bunch of files and keep a log of the changes

This is a more concise answer to http://blog.commandlinekungfu.com/2011/09/episode-158-old-switcheroo.html in my opinion.
This is sample output - yours may be different.
-2

find . -type f | xargs grep -n "Old Text" | tee filesChanged.txt | sed 's/:.*$//' | xargs sed -i 's/Old Text/New Text/g

moogmusic · 2011-09-06 10:28:36 3
List by size all of the directories in a given tree.
This is sample output - yours may be different.
17

du -h /path | sort -h

moogmusic · 2011-09-02 13:26:23 12
List by size all of the directories in a given tree.

This command lists all the directories in SEARCHPATH by size, displaying their size in a human readable format. Show Sample Output
This is sample output - yours may be different.
```
257M    /var/
147M    /var/cache
144M    /var/cache/apt
110M    /var/cache/apt/archives
96M     /var/lib
67M     /var/lib/apt
66M     /var/lib/apt/lists
22M     /var/lib/dpkg
20M     /var/lib/dpkg/info
15M     /var/log
```
-2

SEARCHPATH=/var/; find $SEARCHPATH -type d -print0 | xargs -0 du -s 2> /dev/null | sort -nr | sed 's|^.*'$SEARCHPATH'|'$SEARCHPATH'|' | xargs du -sh 2> /dev/null

moogmusic · 2011-07-06 08:21:58 5

What's this?

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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" }

Printing multiple years with Unix cal command

src: http://tinyapps.org/weblog/nix/200907090700_linux_cal_print_multiple_years.html

geoip information

That makes a function you can put in your ~/.bashrc to run it when you need in any term with an IP as argument

Get pages number of the pdf file

Broadcast your shell thru ports 5000, 5001, 5002 ...

run 'nc yourip 5000', 'nc yourip 5001' or 'nc yourip 5002' elsewhere will produce an exact same mirror of your shell. This is handy when you want to show someone else some amazing stuff in your shell without giving them control over it.

Use top to monitor only all processes with the same name fragment 'foo'

$ pgrep foo may return several pids for process foobar footy01 etc. like this: 11427 12576 12577 sed puts "-p " in front and we pass a list to top: $ top -p 11427 -p 12576 -p 12577

Install pip with Proxy

Installs pip packages defining a proxy

Clear filesystem memory cache

Found here: http://ubuntuforums.org/showthread.php?t=589975

Print Memory Utilization Percentage For a specific process and it's children

Change the name of the process and what is echoed to suit your needs. The brackets around the h in the grep statement cause grep to skip over "grep httpd", it is the equivalent of grep -v grep although more elegant.

View internet connection activity in a browser

In addition to generating the current connections, it also opens then in your default browser on gnome.

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