Adding timestamp to a filename with mv in BASH

Question

Well  I m a linux newbie  and I m having an issue with a simple bash script   I ve got a program that adds to a log file while it s running  Over time that log file gets huge  I d like to create a startup script which will rename and move the log file before each run  effectively creating separate log files for each run of the program  Here s what I ve got so far   pastebin  DATE   date    Y m d H M   mv server log logs  DATE log echo program   When run  I see this     command not found program   When I cd to the logs directory and run dir  I see this   201111211437 r log r   What s going on  I m assuming there s some syntax issue I m missing  but I can t seem to figure it out     UPDATE  Thanks to shellter s comment below  I ve found the problem to be due to the fact that I m editing the  sh file in Notepad   in windows  and then sending via ftp to the server  where I run the file via ssh  After running dos2unix on the file  it works   New question  How can I save the file correctly in the first place  to avoid having to perform this fix every time I resend the file

User · Answer

Well  it s not a direct answer to your question  but there s a tool in GNU Linux whose job is to rotate log files on regular basis  keeping old ones zipped up to a certain limit  It s logrotate

User · Answer

First  thanks for the answers above  They lead to my solution  I added this alias to my  bashrc file  alias now  date   Y- m- d- H  M  S   Now when I want to put a time stamp on a file such as a build log I can do this  mvn clean install   tee build-  now  log  and I get a file name like  build-2021-02-04-03 12 12 log

User · Answer

You can write your scripts in notepad but just make sure you convert them  using this -      sed -i  s  r     yourscripthere    I use it all they time when I m working in cygwin and it works  Hope this helps

User · Answer

A single line method within bash works like this    some out put     date    Y  m  d- H  M  S   ver  will create a file with a timestamp name with ver extension  A working file listing snap shot to a date stamp file name as follows can show it working   find   -type f -exec ls -la         cut -d     -f 6-  gt   date    Y  m  d- H  M  S   ver  Of course   cat somefile log  gt    date    Y  m  d- H  M  S   ver  or even simpler  ls  gt    date    Y  m  d- H  M  S   ver

User · Answer

The few lines you posted from your script look okay to me  It s probably something a bit deeper  You need to find which line is giving you this error  Add set -xv to the top of your script  This will print out the line number and the command that s being executed to STDERR  This will help you identify where in your script you re getting this particular error  BTW  do you have a shebang at the top of your script  When I see something like this  I normally expect its an issue with the Shebang  For example  if you had     bin bash on top  but your bash interpreter is located in  usr bin bash  you ll see this error  EDIT  New question  How can I save the file correctly in the first place  to avoid having to perform this fix every time I resend the file   Two ways   Select the Edit- gt EOL Conversion- gt Unix Format menu item when you edit a file  Once it has the correct line endings  Notepad   will keep them  To make sure all new files have the correct line endings  go to the Settings- gt Preferences menu item  and pull up the Preferences dialog box  Select the New Document Default Directory tab  Under New Document and Format  select the Unix radio button  Click the Close button

User · Answer

mv server log logs   date -d  today     Y m d H M   log

User · Answer

I use this command for simple rotate a file   mv output log  date   F -output log   In local folder I have 2019-09-25-output log

[linux] Adding timestamp to a filename with mv in BASH

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