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display information about the CPU
This is sample output - yours may be different.
1

lscpu | egrep 'Model name|Socket|Thread|NUMA|CPU$s$'

aysadk · 2020-09-19 17:19:09 0
Learn the difference between single and double quotes
This is sample output - yours may be different.
0

a=7; echo $a; echo "$a"; echo '$a'; echo "'$a'"; echo '"$a"'

knoppix5 · 2020-09-10 02:47:40 1
Find ASCII files and extract IP addresses
This is sample output - yours may be different.
0

find . -type f -exec grep -Iq . {} \; -exec grep -oE "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" {} /dev/null \;

wuziduzi · 2020-09-13 03:06:22 1
find hard linked files (duplicate inodes) recursively

If you have two sets of files that may share hard-linked files, it can be useful to identify which ones are hard links to same underlying inode (file). This command shows you all of those, sorted by inode#. In my example the two directory trees to compare share a common parent, so I run the command in that parent and just use find . to start from the current directory. If yours are in different locations, you can pass both paths to find: find /directory1 /directory2 -type f -printf '%10i %p\n' | sort | uniq -w 11 -d -D | less Show Sample Output
This is sample output - yours may be different.
```
 190186228 ./10/alpha1/2612_fsm
 190186228 ./12/alpha1/base/19108/2612_fsm
 190203401 ./10/alpha1/pg_internal.init
 190203401 ./12/alpha1/base/19108/pg_internal.init
 190206322 ./10/alpha1/3079_fsm
 190206322 ./12/alpha1/base/19108/3079_fsm
```
0

find . -type f -printf '%10i %p\n' | sort | uniq -w 11 -d -D | less

dmmst19 · 2020-09-13 22:12:58 1
Find out how much ram memory has your video (graphic) card
This is sample output - yours may be different.
0

glxinfo |grep -i -o 'device|memory\|[0-9]\{1,12\} MB'|head -n 1

wuziduzi · 2020-09-14 02:12:47 1
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 2
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 3
Get an audio notification if a new device is attached to your computer

dmesg -t: no timestamp -W: follow new messages -l: log-level notice gawk if the fourth word is "Attached" echo a sentence through espeak
This is sample output - yours may be different.
-1

dmesg -tW -l notice | gawk '{ if ($4 == "Attached") { system("echo New device attached | espeak") } }

BigZ · 2020-09-06 08:18:26 3
Show which line of a shell script is currently executed

This way you don't need to replace first line of a bash foo.sh script #!/bin/bash with #!/bin/bash -x to obtain the same effect
This is sample output - yours may be different.
-1

bash -x foo.sh

knoppix5 · 2020-09-10 19:56:42 0
Find out how much ram memory has your video (graphic) card

One liner is based on this article: https://www.computerhope.com/issues/ch001307.htm Show Sample Output
This is sample output - yours may be different.
```
$ lspci|grep -i "VGA Compatible Controller"|cut -d' ' -f1|xargs lspci -v -s|grep ' prefetchable'
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
```
-3

lspci|grep -i "VGA Compatible Controller"|cut -d' ' -f1|xargs lspci -v -s|grep ' prefetchable'

knoppix5 · 2020-09-11 14:04:10 6

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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

The simplest way to transport information over a network

Einstein's razor: As simple as possible, but not simpler. On the destination machine netcat listens on any port (1234 in the example) and sends anything it receives into a file or pipe. On the source machine a separate netcat takes input from a file or pipe and sends it over the network to the listener. This is great between machines on a LAN where you don't care about authentication, encryption, or compression and I would recommend it for being simpler than anything else in this situation. Over the internet you should use something with better security.

Print number of mb of free ram

Here we instead show a more real figure for how much free RAM you have when taking into consideration buffers that can be freed if needed. Unix machines leave data in memory but marked it free to overwrite, so using the first line from the "free" command will mostly give you back a reading showing you are almost out of memory, but in fact you are not, as the system can free up memory as soon as it is needed. I just noticed the free command is not on my OpenBSD box.

easily strace all your apache processes

This one-liner will use strace to attach to all of the currently running apache processes output and piped from the initial "ps auxw" command into some awk.

find which lines in a file are longer than N characters

Filter out lines of input that contain 72, or fewer, characters. This uses bash only. ${#i} is the number of characters in variable i.

Find all files under a certain directory /home that have a certain suffix at the end of the file name. Show the file and rename them to remove the suffix.

sync svn working copy and remote repository (auto adding new files)

Lists the local files that are not present in the remote repository (lines beginning with ?) and add them.

Ask for a password, the passwd-style

You can ask repeatedly for a non-blank password using this function: function read_password() { while [ ! -n "$USER_PASSWORD" ]; do read -s -p"Password: " USER_PASSWORD if [ ! -n "$USER_PASSWORD" ]; then echo "ERROR: You must specify a valid password, please try again" fi echo done } Also you can set a time out (in seconds) to write the password read -t 10 -s -p"Password: " USER_PASSWORD_VARIABLE if [ ! $? -eq 0 ]; then echo "Time out!" fi

Calculate your total world compile time. (Gentoo Distros)

From Gentoo Forum, greetings to rudregues & steveL.

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.

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