As part of the same operation, I'll give it its new name, the string " email " followed by a random number generated by the rand command. You may need to install a random number generator: that'll be apt install rand on Ubuntu. That worked fine as long as I didn't happen to receive more than one batch of messages on the same day.
If I did, then the new messages would overwrite older files in that day's directory. I guess it's mathematically possible that my rand command could assign overlapping numbers to two files but, given that the default range rand uses is between 1 and 32,, that's a risk I'm willing to take. At this point, there should be files in the new directory with names like email, email, etc. There are currently no files in tmpemails - that's because the mv command moves files to their new location, leaving nothing behind.
The final section of the script opens each new message in my favorite desktop text editor Gedit. It uses a similar for Note the asterisk I added to the end of the directory location.
There's still one more thing to do. If I don't clean out my S3 bucket, it'll download all the accumulated messages each time I run the script. That'll make it progressively harder to manage. So, after successfully downloading my new messages, I run this short script to delete all the files in the bucket:. If you read this far, tweet to the author to show them you care.
Tweet a thanks. Learn to code for free. Get started. To make that more comfortable avoiding a manual login on the third machine , here is a command to execute on your local machine. See the explanations below for the reason. The command will ssh to your third machine intermediate-host , start downloading a file to there via wget , and start uploading it to target-host via SSH. Downloading and uploading use the bandwidth of your intermediate-host and happen at the same time due to Bash pipe equivalents , so progress will be fast.
For the -T -e none SSH options when using it to transfer files, see these detailed explanations. This command is meant for cases where you can't use SSH's public key authentication mechanism — it still happens with some shared hosting providers, notably Host Europe.
To still automate the process, we rely on sshpass to be able to supply the password in the command. It requires sshpass to be installed on your intermediate host sudo apt-get install sshpass under Ubuntu. We try to use sshpass in a secure way, but it will still not be as secure as the SSH pubkey mechanism says man sshpass.
In particular, we supply the SSH password not as a command line argument but via a file, which is replaced by bash process substitution to make sure it never exists on disk.
The printf is a bash built-in, making sure this part of the code does not pop up as a separate command in ps output as that would expose the password [ source ]. And that without using a temp file [ source ]. But no guarantees, maybe I overlooked something. Again to make the sshpass usage safe, we need to prevent the command from being recorded to the bash history on your local machine. For that, the whole command is prepended with one space character, which has this effect. Normally, SSH would then wait for user input to confirm the connection attempt.
We make it proceed anyway. So we have to rewrite the typical wget -O - … ssh … command into a form without a bash pipe, as explained here. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Ask Question. Asked 8 years, 4 months ago. Active 2 years, 10 months ago. Viewed 62k times. How can I download a file? Improve this question. Chris Snow. Chris Snow Chris Snow 3, 4 4 gold badges 21 21 silver badges 30 30 bronze badges.
I can't remember now if gawk was available, though I'd love to see a gawk based solution if you have one : — Chris Snow. Add a comment. Active Oldest Votes. Update: as mentioned in the comment, the approach outlined above is simplistic: the read will trashes backslashes and leading whitespace.
Bash can't deal with NUL bytes very nicely so binary files are out. Improve this answer. So you answered your own question at the same time as you asked it. That's an interesting time machine you have ; — Meer Borg. MeerBorg - when you ask a question, look for the tick box 'answer your own question' - blog. Can I explain the code? Not yet! But it does work on cygwin. Just a note: This won't work with some configurations of Bash.
I believe Debian configures this feature out of their distribution of Bash. Urgh, while this is a nice trick, it can too easily cause corrupt downloads. None of this I see mentioned in the answer. Show 4 more comments. Use lynx. Note lynx -source is closer to wget — Steven Penny. Hey, so this is a really late comment but how do you save the output of the telnet command to a file?
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