Posted by jpluimers on 2016/08/05
Kev:
Try the command line tool expand.
expand -t 4 input >output
And for those systems that don’t use the GNU Core Utilities, you have a decent chance of expand being installed since it is standardized by The Open Group’s Single Unix Specification. See Issue 6, which is from 2001, though some updates were applied, hence the year of publication being 2004: expand
–jeroen
via bash – How can I convert tabs to spaces in every file of a directory? – Stack Overflow.
Posted in *nix, *nix-tools, bash, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux | Leave a Comment »
Posted by jpluimers on 2016/06/22
Some notes with the links I found them:
"$@" when passing on arguments to other processes: scripting – Propagate all arguments in a bash shell script – Stack Overflow.$* is very confined: Accessing bash command line args $@ vs $* – Stack Overflow.$0 is the command itself; it is not included in $@ or $*: linux – Script parameters in Bash – Stack Overflow.| Syntax | Effective result |
|---|---|
$* |
$1 $2 $3 … ${N} |
$@ |
$1 $2 $3 … ${N} |
"$*" |
"$1c$2c$3c…c${N}" |
"$@" |
"$1" "$2" "$3" … "${N}" |
–jeroen
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Posted by jpluimers on 2016/06/16
Since quite a few commands that you regularly see mentioned on the web have been removed from OpenSuSE net-tools, I’ve created a few bash aliases in /etc/bash.bashrc.local below.
Note the original commands are not good have been deprecated for years on various distros and therefore removed:
# stuff removed from net-tools # see https://features.opensuse.org/317197 and https://build.opensuse.org/package/view_file/network:utilities/net-tools/net-tools.changes ## Because of changes on Thu Apr 10 12:33:41 UTC 2014 alias "arp=echo 'use \"ip neigh\" or \"ip -r neight\"' && ip neigh" alias "ifconfig=echo 'use \"ip a\"' && ip a" alias "netstat= echo 'use \"ss\" or \"ss -r\"' && ss" alias "route=echo 'use \"ip r\"' && ip r" ## Because of changes on Sun Mar 29 00:41:21 UTC 2015 alias "ipmaddr=echo 'use \"ip maddr\"' && ip maddr" alias "iptunnel=echo 'use \"ip tunnel\"' && ip tunnel"
Some bits of the net-tools change-log:
------------------------------------------------------------------- Sun Mar 29 00:41:21 UTC 2015 - jengelh@inai.de - ipmaddr and iptunnel are obsolete too, move them to subpackage. (Superseded by `ip maddr` and `ip tunnel`) - remove redundant %clean section ------------------------------------------------------------------- Thu Apr 10 12:33:41 UTC 2014 - mmarek@suse.cz - Move arp, ifconfig, netstat and route to a -deprecated subpackage (fate#317196, fate#317197) - Drop the rarp tool, which has been broken since kernel 2.3
Note that the -lntu parameter seems to be the same for both ss and netstat: [WayBack] Get a list of Open Ports in Linux – Super User
–jeroen
via File net-tools.changes of Package net-tools – openSUSE Build Service.
Posted in *nix, *nix-tools, bash, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux | Leave a Comment »
Posted by jpluimers on 2016/06/14
Quoting John Hart‘s brilliant answer:
Using
--resolveleverages all of the normal logic that applies, but simply pretends the DNS lookup returned the data in your command-line option. It works just like/etc/hostsshould.Note
--resolvetakes a port number, so for HTTPS you would useHttps:
curl --resolve 'yada.com:443:127.0.0.1' https://yada.com/somethingHttp:
curl --resolve 'yada.com:80:127.0.0.1' http://yada.com/something
It requires curl 7.21.3 or higher (from the end of 2010). Which by now everybody should have.
–jeroen
more via: Set cURL to use local virtual hosts – Stack Overflow.
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Posted by jpluimers on 2016/06/07
Via the answer below I created the renew alias. I already had the first two aliases.
alias route-and-ipaddresses="netstat -nr | grep 'Internet\|Gateway\|default' && echo && ifconfig | grep '\: flags\|inet\|inet6' && echo more detailed info through ifconfig and netstat -nr" alias whatismyip="curl http://whatismyip.akamai.com && echo" alias renew_dhcp="sudo ipconfig set en0 DHCP && echo waiting 10 seconds for DHCP lease to be obtained && sleep 10 && route-and-ipaddresses && whatismyip"
–jeroen
via: network – How can I release and renew my DHCP lease from Terminal? – Ask Different.
Posted in Apple, bash, Development, Mac, Mac OS X / OS X / MacOS, Mac OS X 10.6 Snow Leopard, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, OS X 10.10 Yosemite, OS X 10.8 Mountain Lion, OS X 10.9 Mavericks, Power User, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2016/06/01
I needed to find the symlinks in /etc pointing to directories and know both the name and place they point to.
revue:~ # ls -al `find -L /etc/ -xtype l -type d` find: ‘/etc/ssh/broken/ssh_host_dsa_key’: Too many levels of symbolic links find: ‘/etc/ssh/broken/ssh_host_ecdsa_key’: Too many levels of symbolic links find: ‘/etc/ssh/broken/ssh_host_key’: Too many levels of symbolic links find: ‘/etc/ssh/ssh_host_ecdsa_key’: Too many levels of symbolic links find: ‘/etc/ssh/ssh_host_dsa_key’: Too many levels of symbolic links find: ‘/etc/ssh/ssh_host_key’: Too many levels of symbolic links lrwxrwxrwx 1 root root 19 May 7 15:43 /etc/apparmor.d/cache -> /var/cache/apparmor lrwxrwxrwx 1 root root 6 Sep 28 2014 /etc/rc.d -> init.d lrwxrwxrwx 1 root root 26 May 23 13:50 /etc/squid/errors -> /usr/share/squid/errors/de lrwxrwxrwx 1 root root 28 Mar 25 22:07 /etc/ssl/certs -> /var/lib/ca-certificates/pem lrwxrwxrwx 1 root root 18 Apr 30 14:20 /etc/xdg/systemd/user -> ../../systemd/user
–jeroen
via: bash – How do I find all of the symlinks in a directory tree? – Stack Overflow.
Posted in *nix, *nix-tools, bash, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux | Leave a Comment »
Posted by jpluimers on 2016/05/26
Thanks Adrian W for providing the below example in your answer about obtaining GLUE record information for a domain.
It is an excellent showcase for the $IFS Internal Field Separator available in any nx shell.
In this case it is used to get the TLD (top-level domain) from the domain name specified at the command-line.
After that, it obtains the name servers for that TLD, and queries the glue records there, both using dig.
Here is a little shell script which implements Alnitak’s answer:
#!/bin/sh S=${IFS} IFS=. for P in $1; do TLD=${P} done IFS=${S} echo "TLD: ${TLD}" DNSLIST=$(dig +short ${TLD}. NS) for DNS in ${DNSLIST}; do echo "Checking ${DNS}" dig +norec +nocomments +noquestion +nostats +nocmd @${DNS} $1 NS donePass the name of the domain as parameter:
./checkgluerecords.sh example.org
–jeroen
via domain name system – How to test DNS glue record? – Server Fault.
Posted in *nix, Apple, bash, Development, DNS, Linux, Mac, Mac OS X / OS X / MacOS, Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, openSuSE, OS X 10.10 Yosemite, OS X 10.8 Mountain Lion, OS X 10.9 Mavericks, Power User, Scripting, Software Development, SuSE Linux | Leave a Comment »
Posted by jpluimers on 2016/04/06
Cygwin first run looks like this:
Copying skeleton files. These files are for the users to personalise their cygwin experience. They will never be overwritten nor automatically updated. './.bashrc' -> '/home/jeroenp//.bashrc' './.bash_profile' -> '/home/jeroenp//.bash_profile' './.inputrc' -> '/home/jeroenp//.inputrc' './.profile' -> '/home/jeroenp//.profile' jeroenp@msmxp ~ $
It will copy some default files to your profile so you can modify them.
Since Cygwin will run ~/.bash_profile on logon, and that in turn starts ~/.bashrc (see below), I’ve modified the latter to run ~/.bash_aliases and bring those a bit in sync with my regular Mac machine:
| # New user-defined bash aliases file | |
| # Is executed from a modified .bashrc file | |
| # .bashrc is executed from .bash_profile on cygwin | |
| # on other systems, see http://www.joshstaiger.org/archives/2005/07/bash_profile_vs.html | |
| ## This is the portion in .bashrc you need to edit in cygwin to enable .bash_aliases: | |
| ## Aliases | |
| ## | |
| ## Some people use a different file for aliases | |
| ## if [ -f "${HOME}/.bash_aliases" ]; then | |
| ## source "${HOME}/.bash_aliases" | |
| ## fi | |
| alias ls-8601='ls -l -T' | |
| alias ls-full-8601='ls -l –time-style=full-iso' | |
| # octal file modes through http://stackoverflow.com/questions/1795976/can-the-unix-list-command-ls-output-numerical-chmod-permissions | |
| alias lsmod='ls -al|awk '\''{k=0;s=0;for(i=0;i<=8;i++){;k+=((substr($1,i+2,1)~/[rwxst]/)*2^(8-i));};j=4;for(i=4;i<=10;i+=3){;s+=((substr($1,i,1)~/[stST]/)*j);j/=2;};if(k){;printf("%0o%0o ",s,k);};print;}'\''' | |
| # silence the progress meter on Cygwin with -sS via http://stackoverflow.com/questions/7373752/how-do-i-get-curl-to-not-show-the-progress-bar | |
| alias whatismyip='curl -sS http://whatismyip.akamai.com && echo' |
cURL has some idiosyncrasies, for instance Cygwin shows the progress meter by default, but Mac OS X does not. I wanted to disable the cURL progress meter and you heed -sS for that.
ls doesn’t show you octal file modes by default, but chown and umask use them, so I’ve got the lsmod alias through stack-overflow.
Getting your bash initialisation right can be tough. There are lengthy discussions about which .bash* files run under what circumstances:
–jeroen
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Posted by jpluimers on 2016/03/01
Too bad the accepted answer forgets about deleted files.
Use one of these to compare (but not sync) two directory trees.
For size-only comparision:
rsync -n -avr --size-only --delete /abc/home/sample1/ server2:/abc/home/sample2/
If you want to compare both contents and size:
rsync -n -avrc --delete /abc/home/sample1/ server2:/abc/home/sample2/
–jeroen
via: diff – compare files in two directory on remote server using unix – Stack Overflow.
Posted in *nix, bash, Development, Power User, rsync, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2016/01/31
Awesome read on bash Coding Style · drwetter/testssl.sh Wiki
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The Wiert Corner - irregular stream of stuff 