I am going to schedule a job by using at command. Here I tried the following command: $ at now + 1 minuteecho ‘Test at command'<EOD> I saw the job is scheduled by using at -l. However, I saw no echo out. I guess that I may need to add user to at.allow file. I…

If I have a group of files with a .htm extention, how can I rename them all to .html? mv *.htm *.html does not work. Solution: Or, you could use pure bash… (except for mv, that is..) for file in *.htm; do mv “$file” “${file%.htm}.html”; done and avoid the nasty basename stuff. 😉 Bash has…

I did something crazy at some point that created a file called -rf on my filesystem.Now I can’t figure out how to delete it… I’ve tried: rm “-rf”rm -rf These just exit immediately, arrgh! Anyone know how to remove this file? Preferably without accidentally cleaning out my whole folder. Solution: unlink -rf Or rm –…

I have two files in a directory. One has correct permissions and the other has not. Is there a way I can “copy” the set of permissions from one file to another? Solution: The GNU version of the chmod utility can copy the mode from one file (RFile) to another (file). chmod –reference=RFile file GNU…

There’s a utility called the Lexar BootIt utility that flips the Removable Media Bit on certain USB flash drives. I want to flip the bit on my USB flash drive (it’s supported) but really am not too comfortable downloading this utility from random file-sharing sites, nor do I see a license anywhere for it. The…

I’m running rsync to sync a directory onto my external USB HDD. It’s about 150 gigs of data. 50000+ files I would guess. It’s running it’s first sync at the moment, but its copying files at a rate of only 1-5 MB/s. That seems incredibly slow for a USB 2.0 enclosure. There are no other…

Windows 7 frequently plays the usb/new device connection/disconnection sound. It happens both when the computer is idle and under load. All usb device connections have been checked (though I can’t rule out a bad cable yet). I thought a good way to track down the issue would be to wait for the sound and then…

I had recently upgraded my laptop from Windows 8.1 to 10. Since the upgrade, I am unable to connect my Android devices as MTP (or Portable Media Player) devices on Windows. The devices that I am using are Nexus 4, Samsung Grand 2 and Kindle Fire HD 7″.Prior to the upgrade I was able to…

I have a Windows tablet and otg adapter that can simultanously charge the device but there isn’t enough current flowing to fight the discharge!? I have 4 usb devices attached to my otg usb hub. Can it be the problem? Could a extra powered usb hub solve my problem? Thid isn’t helping me (mostly Android):http://forum.xda-developers.com/showthread.php?t=1822653&page=16….

Which external connection has the highest data throughput with respect to the headers used? I would appreciate a slowest to fastest list including USB 2.0, USB 3.0, FireWire 400, FireWire 800, eSATA and Thunderbolt considering bandwidth that is consumed by command and control (reducing the data bandwidth availability). Solution: The theoretical maximums are as follows:…