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swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)
A simple way yo do a progress bar like wget.
underline() will print $1, followed by a series of '=' characters the width of $1. An optional second argument can be used to replace '=' with a given character.
This function is useful for breaking lots of data emitted in a for loop into sections which are easier to parse visually. Let's say that 'xxxx' is a very common pattern occurring in a group of CSV files.
You could run
$ grep xxxx *.csv
This would print the name of each csv file before each matching line, but the output would be hard to parse visually.
$ for i in *.csv; do printf "\n"; underline $i; grep "xxxx" $i; done
Will break the output into sections separated by the name of the file, underlined.
We use `-not -name ".*"` for the reason we must omit hidden files (which unnecessary). We can only show up total lines like this:
$ find * -type f -not -name ".*" | xargs wc -l | tail -1
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
This just combines multiple mp3's into one mp3 file. Basically it is a easy join for mp3's
The previously-posted one-liner didn't work for me for whatever reason, so I ended up doing this instead.
For ipv6 use: grep -oE "\b([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4}\b"
displays current time in "binary clock" format
(loosely) inspired by: http://www.thinkgeek.com/homeoffice/lights/59e0/
"Decoding":
8421
.... - 1st hour digit: 0
*..* - 2nd hour digit: 9 (8+1)
.*.. - 1st minutes digit: 4
*..* - 2nd minutes digit: 9 (8+1)
Prompt-command version:
PROMPT_COMMAND='echo "10 i 2 o $(date +"%H%M"|cut -b 1,2,3,4 --output-delimiter=" ") f"|dc|tac|xargs printf "%04d\n"|tr "01" ".*"'
