Commands by nnsense (8)

  • Docker's local man pages are (often) half of what you have online, so I wanted that as local man. Install lynx and run my oneliner, then use as follows: dockpage Adjust lynx's page width at will Show Sample Output

    dockpage() { lynx -width=180 --dump$1/ | sed -n '/^Usage/,/On this page/{/On this page/b;p}'; }
    nnsense · 2017-09-18 23:53:34 3
  • Usefull, for example, when many ports are exposed and the docker ps output looks cluttered. Show Sample Output

    alias dockps='docker ps --format "table {{.ID}}\t{{.Image}}\t{{.Status}}\t{{.Names}}"'
    nnsense · 2017-09-18 23:46:47 0
  • Sometimes it's useful to output just the ip address. Or some other information, changing the "ipv4.addresses" in command. The power of awk! Show all possible "greps" with nmcli connection show [yourInterfaceNameHere] Show Sample Output

    showip() { nmcli connection show $1|grep ipv4.addresses|awk '{print $2}' ; }
    nnsense · 2015-05-13 16:24:28 3
  • This is a common use of bind. Hitting any key after will output the key's character sequence. This makes possible using it into a bind command. So pressing ctrl+v and then F2 will output "^[[12~", once binded every time you'll press the function key F2 it will execute your command. Added the \n to make it execute it as well. Show Sample Output

    bind '"<ctrl+v><functionKey>":"command\n"'
    nnsense · 2015-05-11 17:59:09 2
  • I copied this (let's be honest) somewhere on internet and I just made it as a function ready to be used as alias. It shows the 10 most used commands from history. This seems to be just another "most used commands from history", but hey.. this is a function!!! :D Show Sample Output

    mosth() { history | awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | grep -v "./" | column -c3 -s " " -t | sort -nr | nl | head -n10; }
    nnsense · 2015-05-11 17:41:55 3
  • Many times I give the same commands in loop to find informations about a file. I use this as an alias to summarize that informations in a single command. Now with variables! :D Show Sample Output

    fileinfo() { RPMQF=$(rpm -qf $1); RPMQL=$(rpm -ql $RPMQF);echo "man page:";whatis $(basename $1); echo "Services:"; echo -e "$RPMQL\n"|grep -P "\.service";echo "Config files:";rpm -qc $RPMQF;echo "Provided by:" $RPMQF; }
    nnsense · 2015-05-11 16:46:01 3
  • I use this as an alias to get all .service files related a single installed file/conf (if it has services, of course). For rpm based systems ;) Show Sample Output

    qf2s() { rpm -ql $(rpm -qf $1)|grep -P "\.service"; }
    nnsense · 2015-05-11 16:32:16 0
  • Not really alternative, just giving a different behavior listing current directory if no directory given.

    cdls() { if [[ $1 != "" ]] ; then cd $1; ls; else ls; fi };
    nnsense · 2015-05-11 15:52:09 2

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Sort specific lines while editing within vi
Sort lines within vi editor. In this example sort lines 33-61 and lines 4-9 asciibetically.

log rm commands
Sometimes, it is annoying to find your files or directories missing. If you want to log all the rm commands you can put this in /etc/profile.

a function to find the fastest DNS server gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Backup a file with a date-time stamp
1. you don't need to prepend the year with 20 - just use Y instead of y 2. you may want to make your function a bit more secure: buf () { cp ${1?filename not specified}{,$(date +%Y%m%d_%H%M%S)}; }

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Extracts PDF pages as images

list files recursively by size

Set your profile so that you resume or start a screen session on login
From screen's manpage: "Attach here and now. In detail this means: If a session is running, then reattach. If necessary detach and logout remotely first. If it was not running create it and notify the user. This is the author's favorite." Toss this in your ~/.bash_profile so that you never have that "oh crap" moment where you wanted to run something in screen and didn't.

Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Rename files in batch

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