Mar 4, 2019 - Using for loop with Bash is a great way to automate repetitive tasks and improve your workflow. Here are all the basics you need to know! Re: Bash For Loop I'd guess that it's not working because it's processed by /bin/sh not /bin/bash. If you are using it in a script, place the following line at the start of the script.
I possess the using:
Which will go into each listing in my path, installments
a
and imagesa
. However, the result is always 1. Why is definitely that?NoblenectroNoblenectro
2 Answers
From bash(1):
By just removing the parenthesis you have got around that block of code, you would have got something like this:
(furthermore slightly more conventionally formatted)
the result is definitely:
Låkan LindqvistLåkan Lindqvist
Because you put the loop entire body in unneeded 't which makes it carry out in a subshell if I recall correctly.
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I require to write a screenplay that starts my program with various fights, but I'michael brand-new to Party. I start my program with:
./MyProgram.exe Data/data1.txt Wood logs/data1Log.txt
.Here is certainly the pseudocode for what I want to perform:
So I'm actually confused how to create second argument from the 1st one, so it appears like dataABCDLog1.txt and start my system.
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5 Solutions
A couple of information very first: when you make use of
Information/data1.txt
as an point, should it really be/Information/data1.txt
(with a leading cut)? Also, should the outer loop scan just for.txt data files, or all files in /Data? Here's an solution, assuming/Information/data1.txt
and.txt files just:Records:
/Information/.txt
expands to the paths of the text message documents in /Information (includingthe /Data/ part)$(. )
operates a system command and inserts its result at that stage in the command word linebasename somepath.txt
results the foundation component of somepath, with.txt removed from the end (age.gary the gadget guy./Data/file.txt
-gt;document
)
If you required to operate MyProgram with
Alan W. SmithInformation/file.txt
instead of/Data/file.txt
, use'$filename#/'
to eliminate the top cut. On the some other hands, if it's reallyInformation
not/Data
you desire to check out, just usefor filename in Data/.txt
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Sorry for necromancing the line, but whenever you iterate over files by globbing, it's great exercise to avoid the part case where the glob will not match up (which makes the loop adjustable expand to the (un-matching) glob pattern line itself).
For instance:
Reference: Bash Pitfalls
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The
name=$file##./
substitution (layer parameter extension) gets rid of the major pathname up to the final/
.The
Jonathan LefflerJonathan Lefflerbottom=$name%.txt
replacement removes the walking.txt
. It's i9000 a bit more difficult if the extensions can vary.583k96 precious metal badges704 magic badges1054 bronze badges
You can use finds null separated output choice with read to iterate over directory constructions properly.
So for your case
furthermore
will operate the even though loop in the present scope of the software ( procedure ) and permit the result of find to end up being utilized in placing factors if needed
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Looks like you're also trying to perform a home windows document (.exe) Surely you ought to become using powershell. Anyway on a Linux bash cover a easy one-liner will be sufficient.
Or in a bash
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