Re: Creating/saving/appending to files the Cocoa way
Re: Creating/saving/appending to files the Cocoa way
- Subject: Re: Creating/saving/appending to files the Cocoa way
- From: Robert DuToit <email@hidden>
- Date: Mon, 18 Jan 2010 07:28:58 -0500
Hi Bill,
On Jan 17, 2010, at 11:20 PM, Bill Hernandez wrote:
> On Jan 17, 2010, at 7:47 PM, Robert DuToit wrote:
>
>> set somestring to "stat info"
>> set filePath to (POSIX path of (path to desktop)) & "newfile.txt"
>> set oldtext to do shell script "cat " & quoted form of filePath
>> set newtext to oldtext & tab & somestring
>> do shell script "echo " & newtext & " >" & quoted form of filePath
>
> Look at the five examples below
>
> Using Bash all you need to replace the five lines is :
>
> $ echo -n $'\t'hello >> ~/Desktop/hello.txt
Yes it is much simpler from command line but I am using "do shell script."
>
>
>> Craig, I used just the '>>' in my case but since he wanted a tab delineated string I appended the new string to the old one first so the new text is not on a new line. Though there is a simple way to avoid the new line with echo, I think.
>
> Robert,
>
> ( 1 ) echo -n whatever >> ~/Desktop/hello.txt
> the -n prevents a newline from being added to the end of the echo argument
>
> $ echo -n hello >> ~/Desktop/hello.txt
> $ echo -n hello >> ~/Desktop/hello.txt
> $ echo -n hello >> ~/Desktop/hello.txt
>
> ---> hellohellohello
>
> ( 2 ) we can easily add a space by using quotes around the text
>
> $ echo -n "hello " >> ~/Desktop/hello.txt
> $ echo -n "hello " >> ~/Desktop/hello.txt
> $ echo -n "hello " >> ~/Desktop/hello.txt
>
> ---> hello hello hello
>
>
> ( 3 ) adding \t converts the output to t which is not what you want.
>
> $ echo -n \thello >> ~/Desktop/hello.txt
> $ echo -n \thello >> ~/Desktop/hello.txt
> $ echo -n \thello >> ~/Desktop/hello.txt
>
> ---> thellothellothello
>
> ( 4 ) we CAN add a tab character by using $'\t'
>
> $ echo -n $'\t'hello >> ~/Desktop/hello.txt
> $ echo -n $'\t'hello >> ~/Desktop/hello.txt
> $ echo -n $'\t'hello >> ~/Desktop/hello.txt
>
> ---> hello hello hello
>
> ( 5 ) we can add THREE tab characters by using $'\t\t\t'
>
> echo -n $'\t\t\t'hello >> ~/Desktop/hello.txt
> echo -n $'\t\t\t'hello >> ~/Desktop/hello.txt
> echo -n $'\t\t\t'hello >> ~/Desktop/hello.txt
>
> ---> hello hello hello
>
> ( 6 ) However, AppleScript does not like the -n switch
Yes - I am using applescript and tried '-n' but it didn't work. I couldn't find any way to do it simply while using "do shell script."
But I am not that unix savvy and this is a good reminder for echo.
Thanks, Rob
>
> set somestring to "stat info"
> set filePath to do shell script "echo ~/Desktop/hello.txt"
> do shell script "echo -n $'\\t' " & somestring & " >> " & quoted form of filePath
> do shell script "echo -n $'\\t' " & somestring & " >> " & quoted form of filePath
>
> ---> -n stat info
> ---> -n stat info
>
> Bill Hernandez
> Plano, Texas
>
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