UNIX for Dummies Questions & Answers

Thanks for your suggestion Junior helper. But the command 7z e -t zip filename.zip is not working. Please check below

Code:

<servername:/tmp>$ 7z e -t zip Test.zip
Error:
Incorrect command line

Strange. Can you try 7z e DEX_DWH034.zip ?

It it fails too, maybe post the output of 7z --help.

Hi thanks for your command . It is useful. But I want the command for standard output (which shows the data in the command prompt while unzipping the file). same like as unzip -p -a . And the worst part is that I don't want to use any pipeline symbols ( for saving to a file and or using more or less eg : 7z -e filename | more)

This could be the command you're after:

Code:

7z e -so filename.zip 2>/dev/null

---------- Post updated at 02:42 PM ---------- Previous update was at 02:40 PM ----------

2>/dev/null is required, otherwise 7z will complain:

Code:

Error:
I won't write data and program's messages to same terminal

Hi thanks .. it was helpful. Just a doubt. what is meant by 2>/dev/null

---------- Post updated at 07:49 AM ---------- Previous update was at 07:45 AM ----------

And how can I edit that in the code ?

> what is meant by 2>/dev/null

In this context, it's kind of difficult to explain, but I'll try. It has to do with "streams" produced by a program. When a program is executed, it can produce standard output (stdout on "channel" 1) or standard error (stderr on "channel" 2) or both at the same time. The streams are shown on the terminal.

When you run 7z e file.zip, it will print some output to stdout (7z program data).

When you run 7z e -so file.zip, 7z will try to write data content of the files in the zip archive to stdout due to the -so option. At the same time it is putting the 7z program data on stderr (this is how I interpret it, though). Still, both stdout and stderr are connected to the terminal, and that's why 7z would complain.

2>/dev/null will simply redirect the 7z's program data to "nowhere" and thus make the -so option possible. Of course you could redirect the program data to a file and see what's exactly in there. Use 2>somefile.txt to do that.

Read https://en.wikipedia.org/wiki/Standard_streams for further details on streams.

Fortunately, following syntax is possible too: 7z e -so 2>/dev/null filename.zip, so things don't get too complicated.

Code:

sed 's/\/usr\/bin\/unzip -p -a/7z e -so 2>\/dev\/null/' codefile

If it works on the terminal, try following to perform the actual edit:

Code:

sed -i 's/\/usr\/bin\/unzip -p -a/7z e -so 2>\/dev\/null/' codefile

Hope this helps.

That error occurred because there was a space between the -t and the zip, there should be none.

Code:

7z e -tzip Test.zip

Also, 7z will give you an exit code that might be helpful on what failed. You view that exit code by echo $? after the command is issued