Sometimes you have to deliver or you even get your server certificate files in the pfx file format (personal information exchange, see https://msdn.microsoft.com/en-us/library/windows/hardware/ff549703(v=vs.85).aspx), that is commonly used in Windows based environments. The following paragraphs show, how to export or extract a certificate to or from PFX. Export cert to PFX In order to export the Certificate, Private Key and any […]
If you are working in teams using different operating systems, it could happen, that you get files with unsuitable linefeeds in it. For me as a Linux user the bad guys are normally CRLF’s (Carriage Return and Line Feed @see https://en.wikipedia.org/wiki/Newline). To just convert the CRLF’s in a single file to LF you can use the […]
For some applications it is necessary to keep the file size of an PDF under a certain limit. For example for document uploads on some websites or to maintain the attachment file size limit of some email server. You can use the following shell script to have a schrink command (Source: https://dev.to/manishfoodtechs/shrinking-file-size-of-pdf-using-a-small-bash-script-2pd1). Usage Webservice to shrink […]
You can connect to an SFTPÂ server via keyfile like that: $> sftp -v -o IdentityFile=”/PATH/TO/PUBLICKEYFILE(id_rsa)” -o Port=”10022″ user@host
Today I ran again into a common problem when dealing with cron based scipts that run concurrently. That’s why I had to lock shellscript process until it is finished before starting the next executing round. On Unix based systems like Linux you can achieve that with flock. flock binds a file descriptor to a certain lock […]
To Rename file to upper case or lower case (* == file selector): Convert to lower case file names Convert to upper case
You can download files protected by Basic Htaccess Auth via wget like that: $> wget –http-user=USERNAME –http-password=PASSWORD http://nice.file.url Or via curl like that: $> curl -u USER:PASSWORD http://www.caplantic.de
To get your public IP you can use websites like www.whatismypublicip.com/ or just google for it (http://lmgtfy.com/?q=public+ip) But you can also get your public IP via the following Linux shell  command (the smart way :-D): $> curl ifconfig.me/all This gives you an output like that: ip_addr: 31.18.198.134 remote_host: ip123456.dynamic.kabel-deutschland.de user_agent: curl/7.35.0 port: 47745 lang: connection: keep_alive: encoding: […]
For a home automation project I have to setup a local DynDNS client on my Banana Pi running with Raspian. Here are the steps I’ve taken to run a DynDNS client under Raspbian (will work on other Debian based Linux distributions too): Install ddclient package: $>sudo apt-get install ddclient This command installs the package and starts the DynDNS […]
To rename all jpg-files in a folder to its lower cased equivalent, you can run this little shell script: $> for i in folderpath/*.jpg; do mv -v $i `echo $i | tr ‘[:upper:]’ ‘[:lower:]’`; done The -v param of mv will only give you a list of renamed files.
