Commands by forestb

Commands by forestb (5)

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output absolute path of the present working directory

I've seen a lot of overly complicated attempts at figuring out "where am I?" I think this is a part of the problem: type -a pwd force the use of the binary version of `pwd` instead of the built-in with "/bin/pwd -P" -P option provides an absolute path to the present working directory for the overly cautious type: (which pwd) -P Show Sample Output
This is sample output - yours may be different.
```
/home/forest
```
1

/bin/pwd -P

forestb · 2015-11-21 22:26:57 10
displays the uptime in a friendly way

useful for human readable reports Show Sample Output
This is sample output - yours may be different.
```
murgatroyd restarted 4 days ago
```
0

echo "$HOSTNAME restarted $(uptime | tr , ' ' | awk '{print $3" "$4}') ago"

forestb · 2015-11-20 19:25:15 10
display IP addresses with 5 or more unsuccessful login attempts today

display IP's that unsuccessfully attempted to login 5 or more times today may want to filter any trusted IP's and the localhost useful for obtaining a list IP addresses to block on the firewall Show Sample Output
This is sample output - yours may be different.
```
the output is zero or more IP addresses
```
-1

lastb -i | grep "$(date '+%a %b %d')" | awk '{ print $3 }' | sort | uniq -c | awk '{ if ($1 >= 5) print $2; }'

forestb · 2015-11-20 07:19:20 10
displays working directories 10 largest files in bytes and quickly

# displays 10 largest files and folders in bytes # last entry is largest # similar output to this: du -sk * | sort -nr | head Show Sample Output
This is sample output - yours may be different.
```
/bin# du -sk * | sort -n | tail
136     cpio
148     less
152     egrep
156     grep
188     nano
244     ip
304     tar
400     dbus-daemon
940     bash
1792    busybox
```
0

du -sk * | sort -n | tail

forestb · 2015-09-26 23:00:12 9
Generate a directory path based on the date and time

Great for backup / restore scripts. May want to remove the %M/%S to group backups by hour. If using a script, set a variable earlier with the date command, then reference that variable. Otherwise, time will keep on rolling ;-) declare -rx script_start_time="$(date '+./%Y/%m/%d/%H/%M/%S')" mkdir -p "$script_start_time" Show Sample Output
This is sample output - yours may be different.
```
forest@murgatroyd:~/2015/11/21/00/39/56$ pwd
/home/forest/2015/11/21/00/39/56
```
0

mkdir -p "$(date '+./%Y/%m/%d/%H/%M/%S')"

forestb · 2015-09-25 08:56:26 11

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Empty Bind9 cache

Occasionally, to force zone updating, cache flush is necessary. The use of this command is better than restart the Bind9 process.

exec chmod to subfiles

Using `-exec cmd {} +` causes find to build the command using all matching filenames before execution, rather than once per file.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Simple addicting bash game.

hold period (or whatever character) and hit enter after a second. You need to make the next line of periods the same length as the previous line... score starts at 0 and increase each time length of line is same.

show how many regex you use in your vim today

i want to count how many regex code i have used in vim in a long time so i make a directory in svn host and post record to this directory of course i dont want to post manually so i worte a script to do that and this is the core thing to do

Preserve user variables when running commands with sudo.

In this case the current user has proxy variable set which allows access to the rpm on the internet but needs root privs to install it. Running sudo -E preserves the current user proxy var and allows the rpm install to be executed with sudo.

Harder, Faster, Stronger SSH clients

We force IPv4, compress the stream, specify the cypher stream to be Blowfish. I suppose you could use aes256-ctr as well for cypher spec. I'm of course leaving out things like master control sessions and such as that may not be available on your shell although that would speed things up as well.

Rsync two directories with filtered extensions

Produce 10 copies of the same string

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