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Commands by polar

Terminal - Commands by polar - 5 results

seq 8 | awk '{print "e(" $0 ")" }' | bc -l

2010-08-14 02:52:39

User: polar

Functions: awk bc seq

Tags: awk seq bc

Up
Down

Generate trigonometric/log data easily

If you want a sequence that can be plotted, do:

seq 8 | awk '{print "e(" $0 ")" }' | bc -l | awk '{print NR " " $0}'

Other bc functions include s (sine), c (cosine), l (log) and j (bessel). See the man page for details.

echo notify-send test | at now+1minute

2010-08-08 03:11:11

User: polar

Functions: at echo test

Tags: notify-send

Up
Down

I finally found out how to use notify-send with at or cron

The simplest way to do it.

Works for me, at least. (Why are the variables being set?)

Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

echo "obase=2; 27" | bc -l

2009-03-25 09:54:50

User: polar

Functions: bc echo

Tags: bc

Up
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Base conversions with bc

Easily convert numbers to their representations in different bases. Passing

"ibase=16; obase=8; F2A"

to bc will convert F2A (3882 in decimal) from Hex to Octal, and so on.

echo "$math_expr" | bc -l

2009-03-25 09:46:01

User: polar

Functions: bc echo

Tags: bc

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Quick calculator at the terminal

Useful for quick calculations at the command line. $math_expr is any arithmetic expression (see sample output):

4.5*16+3^2

s(3.1415926/2)

More options in the bc man page.

ls /some/directory | sed -rn -e 's/input_file_regex/mv -v & output_file_name/p' | sh

2009-03-25 09:20:15

User: polar

Functions: ls sed

Tags: bash sed

-2

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Easy Regex based mass renaming

Allows for quick mass renaming, assuming the user has some familiarity with regular expressions. Basically, it replaces the original_file_name in the output of ls with

"mv -v original_file_name new_file_name"

and passes the output to sh.