Commands using ls (517)

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Makefile argument passing
This would allow reference of $(VAR) (if defined) with the value 'foobar' within the Makefile.

grep for minus (-) sign
Use flag "--" to stop switch parsing

Print a row of 50 hyphens
Get there by going backwards and forgetting the numbers.

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

paste one file at a time instead of in parallel
paste one file at a time instead of in parallel

Prettify an XML file
Generated XML files often are poorly formatted. Use this command to properly indent and normalize the file in-place.

Short one line while loop that outputs parameterized content from one file to another

Generate a graph of package dependencies
Requires: imagemagick and graphviz On Debian systems, displays a graph of package dependencies. Works also with other image formats, like svg : $ apt-cache dotty bash | dot -T svg | display

Bitcoin Brainwallet Base58 Encoder
A bitcoin "brainwallet" is a secret passphrase you carry in your brain. The Bitcoin Brainwallet Private Key Base58 Encoder is the third of three functions needed to calculate a bitcoin PRIVATE key from your "brainwallet" passphrase. This base58 encoder uses the obase parameter of the amazing bc utility to convert from ASCII-hex to base58. Tech note: bc inserts line continuation backslashes, but the "read s" command automatically strips them out. I hope that one day base58 will, like base64, be added to the amazing openssl utility.

cd up a number of levels
Instead of typing "cd ../../.." you can type ".. 3". For extremely lazy typists, you can add this alias: alias ...=".. 2" ....=".. 3" - so now you can write just .... !!! NB the .. function needs to be "source"d or included in your startup scripts, perhaps .bashrc.


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