Commands by vwal

Commands by vwal (4)

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tar the current directory wihtout the absolute path

tars the current directory (and its children) in an archive of the same name (plus ".tar" :)) in the parent directory without the absolute path, so that when the archive is extracted, only the current directory name is created for the path. Assumes bash/zsh.
This is sample output - yours may be different.
1

ORIGDIR=${PWD##*/}; PARENT=`dirname $PWD`; tar -C $PARENT -cf ../${ORIGDIR}.tar $ORIGDIR

vwal · 2013-11-04 18:44:34 15
Nicely display permissions in octal format with filename

Since the original command (#1873) didn't work on FreeBSD whose stat lacks the "-c" switch, I wrote an alternative that does. This command shows also the fourth digit of octal format permissions which yields the sticky bit information. Show Sample Output
This is sample output - yours may be different.
```
-r-xr-xr-x 0555 cat
-r-xr-xr-x 0555 chflags
-r-xr-xr-x 0555 chio
-r-xr-xr-x 0555 chmod
-r-xr-xr-x 0555 cp
-r-xr-xr-x 0555 csh
-r-xr-xr-x 0555 date
-r-xr-xr-x 0555 dd
-r-xr-xr-x 0555 df
-r-xr-xr-x 0555 domainname
```
2

stat -f '%Sp %p %N' * | rev | sed -E 's/^([^[:space:]]+)[[:space:]]([[:digit:]]{4})[^[:space:]]*[[:space:]]([^[:space:]]+)/\1 \2 \3/' | rev

vwal · 2009-08-04 08:45:20 3
Delete all aliases for a network interface on a (Free)BSD system

The example command deletes all aliases for network interface 'em0' assuming that the aliases have netmask of 255.255.255.255 and the master IP has some other netmask (such as 255.255.255.0). See here -> http://my.galagzee.com/2009/07/22/deleting-all-network-interface-aliases/ for more on the rationale of this command.
This is sample output - yours may be different.
3

ifconfig | grep "0xffffffff" | awk '{ print $2 }' | xargs -n 1 ifconfig em0 delete

vwal · 2009-08-04 05:18:36 3
Create AUTH PLAIN string to test SMTP AUTH session

I use this as an alias: alias authplain "printf '\!:1\0\!:1\0\!:2' | mmencode | tr -d '\n' | sed 's/^/AUTH PLAIN /'" then.. # authplain someuser@somedomain.com secretpassword AUTH PLAIN c29tZXVzZXJAc29tZWRvbWFpbi5jb20Ac29tZXVzZXJAc29tZWRvbWFpbi5jb20Ac2VjcmV0cGFzc3dvcmQ= # Show Sample Output
This is sample output - yours may be different.
```
AUTH PLAIN dmlsbGUAdmlsbGUAc2FsYXNhbmE=
```
4

printf '\!:1\0\!:1\0\!:2' | mmencode | tr -d '\n' | sed 's/^/AUTH PLAIN /'

vwal · 2009-08-04 05:04:50 4

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Show word-by-word differences between two latex files, in color

list files recursively by size

Remove all zero size files from current directory (not recursive)

works only in zsh

Better recursive grep with pretty colors... requires ruby and gems (run: "gem install rak")

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

finding more large files

Remove security limitations from PDF documents using QPDF

Remove security restrictions from PDF documents using this very simple command on Linux and OSX. You need QPDF installed (http://qpdf.sourceforge.net/) for this to work.

Copy ssh keys to user@host to enable password-less ssh logins.

To generate the keys use the command ssh-keygen

Renaming a file without overwiting an existing file name

Sometimes in a hurry you may move or copy a file using an already existent file name. If you aliased the cp and mv command with the -i option you are prompted for a confirmation before overwriting but if your aliases aren't there you will loose the target file! The -b option will force the mv command to check if the destination file already exists and if it is already there a backup copy with an ending ~ is created.

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"

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Commands by vwal (4)

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