It’s an abbreviation of Error NO ENTry (or Error NO ENTity), and can actually be used for more than files/directories. It’s abbreviated because C compilers at the dawn of time didn’t support more than 8 characters in symbols.
In cross-platform, lowest-common-denominator sh you use: #!/bin/sh value=`cat config.txt` echo “$value” In bash or zsh, to read a whole file into a variable without invoking cat: #!/bin/bash value=$(<config.txt) echo “$value” Invoking cat in bash or zsh to slurp a file would be considered a Useless Use of Cat. Note that it is not necessary to … Read more
I’m assuming you want to still see standard error and standard output on the terminal. You could go for Josh Kelley’s answer, but I find keeping a tail around in the background which outputs your log file very hackish and cludgy. Notice how you need to keep an extra file descriptor and do cleanup afterward … Read more
curl -s http://google.com > temp.html works for curl version 7.19.5 on Ubuntu 9.10 (no progress bar). But if for some reason that does not work on your platform, you could always redirect stderr to /dev/null: curl http://google.com 2>/dev/null > temp.html
I always wanted to do this and found a nice and easy way of doing it. I wrote down the complete procedure just in case anyone else needs it. First install a 16 kB program called xclip: sudo apt-get install xclip You can then pipe the output into xclip to be copied into the clipboard: cat … Read more
In your terminal, type: scp your_username@remotehost.edu:foobar.txt /local/dir replacing the username, host, remote filename, and local directory as appropriate. If you want to access EC2 (or other service that requires authenticating with a private key), use the -i option: scp -i key_file.pem your_username@remotehost.edu:/remote/dir/foobar.txt /local/dir From: http://www.hypexr.org/linux_scp_help.php
There are three approaches to finding the name of the current shell’s executable: Please note that all three approaches can be fooled if the executable of the shell is /bin/sh, but it’s really a renamed bash, for example (which frequently happens). Thus your second question of whether ps output will do is answered with “not … Read more
From the manual: -N or –LINE-NUMBERS Causes a line number to be displayed at the beginning of each line in the display. You can also toggle line numbers without quitting less by typing -N. It is possible to toggle any of less’s command line options in this way.
Also worth mentioning: tac (the, ahem, reverse of cat). Part of coreutils. Flipping one file into another tac a.txt > b.txt
head and pipe with tail will be slow for a huge file. I would suggest sed like this: sed ‘NUMq;d’ file Where NUM is the number of the line you want to print; so, for example, sed ’10q;d’ file to print the 10th line of file. Explanation: NUMq will quit immediately when the line number … Read more