Commands by fromthestone

Commands by fromthestone (3)

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SSH Copy ed25519 key into your host
This is sample output - yours may be different.
1

ssh-copy-id -i your-ed25519-key user@host

fromthestone · 2019-04-11 02:23:46 34
Append a pub key from pem file and save in remote server accessing with another key

Useful if you need to add another key and you using pem files (typical in AWS EC2 Instances). If you use it in EC2 instances, remember that password authentication is disabled, so you have to use the first key generated when you generated the instance
This is sample output - yours may be different.
1

ssh-keygen -y -f user-key.pem | ssh user@host -i already_on_remote_server_key.pem 'cat >> ~/.ssh/authorized_keys'

fromthestone · 2019-02-21 08:37:31 32
Delete specific sender in mailq
This is sample output - yours may be different.
1

postqueue -p | tail -n +2 | awk 'BEGIN { RS = "" } / user@example\.com/ { print $1 }' | tr -d '*!' | postsuper -d -

fromthestone · 2015-02-12 01:01:59 8

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Insert a line at the top of a text file without sed or awk or bash loops

Yet another way to add a line at the top a of text file with the help of the tac command (reverse cat).

put current directory in LAN quickly

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Tell what is encoded in a float, given its HEX bytes

It handles all possible combination of the hex bytes, including NaNs, Infinities, Normalized and Subnormal Numbers... $ This crazy DC stuff spent me a few days to write, optimize, polish and squeeze so that it works within the tight 255 character bound... $ You can modify it easily for other IEEE754 numbers, say, half, double, double-extended, quadruple $ (I hope someone will find this useful and submit more dc code to commandlinefu!)

how many pages will my text files print on?

This gives a very rough estimate of how many pages your text files will print on. Assumes 60 lines per page, and does not take long lines into account.

Awk: Perform a rolling average on a column of data

Sometimes jittery data hides trends, performing a rolling average can give a clearer view.

Using numsum to sum a column of numbers.

if you, like me, do not have the numsum, this way can do the same.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

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