SRE – Systems/Network
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Let’s imagine that we have the following directory listing:
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$ ls -ls /data/db1/ total 4778688 1488 -rw-r--r-- 1 dbmaster 760264 Feb 14 00:20 database_2016_file1 496 -rw-r--r-- 1 dbmaster 251529 Dec 29 12:45 database_2016_file2 808960 -rw-r--r-- 1 dbmaster 414187520 Jan 30 10:20 database_2016_file3 344 -rw-r--r-- 1 dbmaster 172544 Mar 18 00:42 database_2016_file4 958528 -rw-r--r-- 1 dbmaster 490764886 Feb 7 12:18 database_2016_file5 19480 -rw-r--r-- 1 dbmaster 9970189 Mar 2 17:31 database_2016_file6 2813952 -rw-r--r-- 1 dbmaster 1440743424 Mar 20 10:00 database_2016_file7 160336 -rw-r--r-- 1 dbmaster 82088969 Mar 22 10:30 database_2016_file8 14632 -rw-r--r-- 1 dbmaster 7490048 Mar 16 16:13 database_2016_file9 104 -rw-r--r-- 1 dbmaster 51525 Mar 2 16:18 database_2016_idx1 32 -rw-r--r-- 1 dbmaster 16114 Dec 14 18:55 database_2016_idx2 144 -rw-r--r-- 1 dbmaster 71056 Dec 6 13:32 database_2016_idx3 40 -rw-r--r-- 1 dbmaster 18214 Mar 9 12:38 database_2016_idx4 104 -rw-r--r-- 1 dbmaster 8686 Jan 5 09:10 database_2016_idx5 48 -rw-r--r-- 1 dbmaster 21316 Dec 14 20:01 database_2016_idx6 |
We would like to get a copy of those files named 2016 with a new name for the 2017 year, but we need to keep same content and retro-compatibility. For that, it’s easier to create some symbolic links of all those files instead of doing copies.
You can so use this command for creating those symlinks:
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find /data/db1/ -type f -name "database_2016*" -exec bash -c 'ln -s $1 ${1/2016/2017}' -- {} ; |
We are now getting this, as expected:
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$ ls -ls /data/db1/ total 4778808 1488 -rw-r--r-- 1 dbmaster 760264 Feb 14 00:20 database_2016_file1 496 -rw-r--r-- 1 dbmaster 251529 Dec 29 12:45 database_2016_file2 808960 -rw-r--r-- 1 dbmaster 414187520 Jan 30 10:20 database_2016_file3 344 -rw-r--r-- 1 dbmaster 172544 Mar 18 00:42 database_2016_file4 958528 -rw-r--r-- 1 dbmaster 490764886 Feb 7 12:18 database_2016_file5 19480 -rw-r--r-- 1 dbmaster 9970189 Mar 2 17:31 database_2016_file6 2813952 -rw-r--r-- 1 dbmaster 1440743424 Mar 20 10:00 database_2016_file7 160336 -rw-r--r-- 1 dbmaster 82088969 Mar 22 10:30 database_2016_file8 14632 -rw-r--r-- 1 dbmaster 7490048 Mar 16 16:13 database_2016_file9 104 -rw-r--r-- 1 dbmaster 51525 Mar 2 16:18 database_2016_idx1 32 -rw-r--r-- 1 dbmaster 16114 Dec 14 18:55 database_2016_idx2 144 -rw-r--r-- 1 dbmaster 71056 Dec 6 13:32 database_2016_idx3 40 -rw-r--r-- 1 dbmaster 18214 Mar 9 12:38 database_2016_idx4 104 -rw-r--r-- 1 dbmaster 8686 Jan 5 09:10 database_2016_idx5 48 -rw-r--r-- 1 dbmaster 21316 Dec 14 20:01 database_2016_idx6 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file1 -> /data/db1/database_2016_file1 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file2 -> /data/db1/database_2016_file2 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file3 -> /data/db1/database_2016_file3 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file4 -> /data/db1/database_2016_file4 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file5 -> /data/db1/database_2016_file5 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file6 -> /data/db1/database_2016_file6 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file7 -> /data/db1/database_2016_file7 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file8 -> /data/db1/database_2016_file8 8 lrwxr-xr-x 1 dbmaster 30 Mar 24 13:59 database_2017_file9 -> /data/db1/database_2016_file9 8 lrwxr-xr-x 1 dbmaster 29 Mar 24 13:59 database_2017_idx1 -> /data/db1/database_2016_idx1 8 lrwxr-xr-x 1 dbmaster 29 Mar 24 13:59 database_2017_idx2 -> /data/db1/database_2016_idx2 8 lrwxr-xr-x 1 dbmaster 29 Mar 24 13:59 database_2017_idx3 -> /data/db1/database_2016_idx3 8 lrwxr-xr-x 1 dbmaster 29 Mar 24 13:59 database_2017_idx4 -> /data/db1/database_2016_idx4 8 lrwxr-xr-x 1 dbmaster 29 Mar 24 13:59 database_2017_idx5 -> /data/db1/database_2016_idx5 8 lrwxr-xr-x 1 dbmaster 29 Mar 24 13:59 database_2017_idx6 -> /data/db1/database_2016_idx6 |
If your machine is behind a proxy, you probably configured your browser for going through the proxy to reach Internet. But what about command line with curl and wget?
If you want to add the proxy temporarily for some few installations for example, just type (by replacing URL and port with yours):
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export http_proxy=http://MyProxyURL:3128 export https_proxy= http://MyProxyURL:3128 |
If you want to make the changes globally and keep it after a restart (or a new login), you can:
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http_proxy=http://MyProxyURL:3128 https_proxy=http://MyProxyURL:3128 use_proxy=on wait=15 |
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http_proxy=http://MyProxyURL:3128 https_proxy=http://MyProxyURL:3128 |
If you need authentication, you can simply include username and password in your connection string like:
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