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Top Forums UNIX for Dummies Questions & Answers How to Repeat history command? Post 302958888 by bakunin on Tuesday 27th of October 2015 06:44:31 AM
Old 10-27-2015
Quote:
Originally Posted by Ramanareddygv
Assume i have typed 4 commands in the past like
Code:
vi `ls -t |head -n 1`
tail -2 test.txt
ls -lrt | grep "/etc/profile.d"
pwd

Now if i type r p it should execute the command "pwd" likewise r t should execute tail -2 test.txt.

You haven't told us which system and which shell you use, but from your use of the r alias i deduce it is an AIX system. r is an alias itself for:

Code:
fc -e -

I agree with rbatte1, it is a dangerous thing to rely on something spurious like the command history. If you want to repeatedly execute a (group of) command(s) then put them into a script, not an alias.

I hope this helps.

bakunin
 

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ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)
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