Simple BASH tutorial: the for loop

This is a quick once over of some really common for looping uses and options. A small collection of commands that i found really useful in the early days.

Category:

Education

Tags:

• bash
• for loop
• tutorial
• shell
• unix
• ubuntu
• scripting
• script
• basic

[MsHollandj]

#!/bin/bash

x=0

for f in $( ls *.sid); do x=`expr $x + 1`

# echo number of file we are on + name of file echo $x $f

# perform analysis, output to new file gdal_translate -of GTiff -outsize 31238 39915 $f res_$f

done

I need this script to loop through a folder of images on windows and change the pixels and format from .sid to .tif using Gdal but it run can use please help. I have python and cygwin on my pc but this is my first time using any of these programs.

[deltaray3]

I'm surprised you don't have 20 comments asking you how you got your shell to work like that (auto erasing echos and wget progress). Of course, I know you fudged it yourself. Probably a bit confusing for someone trying to learn.

[saeed2008aae]

Thanks a lot!! pretty much helpful

[sethfulton]

Thanks for posting this. I was easily able to figure out how to download 26 embedded flash videos from a web site via the command line w/curl based on the example given at 1:13

[dilibau]

ceauless bulaaaaaaan

[RoboOmega3]

Thanks!