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Oct 27, 2021 · In shell, when you see. $ command one && command two. the intent is to execute the command that follows the && only if the first command is successful. This is idiomatic of Posix shells, and not only found in Bash. It intends to prevent the running of the second process if the first fails.
As an aside, OS X users should make sure their file contains LINUX or UNIX-style Line breaks/End-Of-Line indicators (LF) instead of MAC OS X - style end-of-line indicators (CR) - the split and csplit commands will not work if your like breaks are Carriage Returns instead of LineFeeds.
Feb 27, 2011 · If you want to stop execution on failed commands, add && at the end of each line except the last one. Example (replace # with Ctrl+V Ctrl+J): $ echo 1 &&#. failed-command &&#. echo 2. Output: 1. failed-command: command not found. In zsh you can also use Alt+Enter or Esc+Enter instead of Ctrl+V Ctrl+J.
Jul 2, 2019 · Short answer is, yes. The concept is known as shell scripting, or bash scripts (a common shell). In order to create a simple bash script, create a text file with this at the top: #!/bin/bash. Then paste your commands inside of it, one to a line. Save your file, usually with the .sh extension (but not required) and you can run it like: sh foo.sh.
Aug 27, 2014 · 174. The POSIX specification for find says: -mtime n The primary shall evaluate as true if the file modification time subtracted from the initialization time, divided by 86400 (with any remainder discarded), is n. Interestingly, the description of find does not further specify 'initialization time'. It is probably, though, the time when find is ...
Dec 10, 2009 · If this approach is used at all, more precautions must be taken, such as ensuring that no arbitrary user commands can be executed. Windows 10 My version of Windows 10 still has Windows Script Host which can run JScript on the console with the wscript.exe or cscript.exe programs, i.e. no browser needed.
Sep 5, 2011 · If you want to execute a command over a range of file (or directory) names returned by the "find" command, Colin is correct, you need to look at the "-exec" option of "find". If you're looking to execute a command over a bunch of arguments listed in a file or coming from stdin, you need to check out the "xargs" commands.
Jun 6, 2013 · 79. This grep command will give you a precise result when you are searching for specific text on Linux -. grep -inRsH "Text to be searched" /path/to/dir (it can be '.') i stands for ignore case distinctions. R stands for recursive and it also include symlinks. It is better to use 'R' instead of 'r'.
Jun 4, 2009 · compgen -c will list all the commands you could run. compgen -a will list all the aliases you could run. compgen -b will list all the built-ins you could run. compgen -k will list all the keywords you could run. compgen -A function will list all the functions you could run. compgen -A function -abck will list all the above in one go.
Aug 27, 2010 · I'm writing a script to automate some command line commands in Python. At the moment, I'm doing calls like this: cmd = "some unix command" retcode = subprocess.call(cmd,shell=True) However, I need to run some commands on a remote machine. Manually, I would log in using ssh and then run the commands. How would I automate this in Python?
