I regularly use the find command in scripts to clean directories on my servers. The common way to use find to do this is to write something like: find ./my_dir -name ‘cache-*’ -exec rm -rf \{\} \; It works fine but it always outputs messages like this: find: ./mydir/cache-001: No such file or director which [...]
I needed a script for a quick health check of a bunch of servers. This is how I did it using the ping command: for((i=1;i<42;i++)); do ping -c 1 -W 3 host${i}.domain.com &> /dev/null if [ $? -ne 0 ] ; then echo “host${i} is down” else echo “host${i} is up” fi done You can [...]
I wrote previously a how-to to set your iTerm tab title. I finally found a tool to do the same thing with the default Mac OS X Terminal. Check it out here, it works perfectly for me! link is dead. On my Mac OS X 10.6.6 and bash (3.2.48(1)-release), you can set your tab title [...]
If you need to sum the total size of files in a directory or matching a pattern, an easy solution is to use awk. I needed to calculate this total for a set of javascript files, I used this command line: $ find App/ -name ‘*.js’ -exec ls -l \{\} \; | awk ‘{sum+=$5} END [...]
While monitoring a http/php server, I needed to do some statistics about php-cgi memory usage. Playing with memory_limit in PHP, we wanted to know the average memory usage per php-cgi process. This is easily calculated with our best friend awk. First, get the number of php running processes: # ps aux | grep php-cgi | [...]
This post is a quick ref on the linux touch command. All the examples have been tested on Linux. This command is used to update the access and modification times of files. touch’s syntax touch [option] file_name(s) touch file1 file2 file3 Here some examples: # touch /tmp/file # ls -l /tmp/file rw-r–r– 1 charlybr charlybr [...]
Sometimes you need to retrieve a single file from SVN without doing a checkout on the repository. SVN provides the svn cat to output the content of a file. You can redirect the output to get the file as : svn cat https://svn.mydomain.com/project/folder/file.ext > file.ext You can also use a simple shell script to do [...]
If like me you use iTerm for your terminal sessions, this is the tips to dynamically set the tab title. As I’m using the bash shell, the tab title can be automatically set with the PROMPT_COMMAND variable. You can set this variable in /etc/profile or in your .bashrc Mine is like this : export PROMPT_COMMAND=’echo [...]
As read here, this is my command line history on my MacBook : [cc lang="bash" line_numbers="false"]$ history 1000 | awk ‘{a[$2]++}END{for(i in a){print a[i] ” ” i}}’ | sort -rn | head[/cc] [cc lang="bash" line_numbers="false"] 240 ssh 62 cd 55 scp 33 for 28 vim 25 ping 17 history 13 ls 4 sudo 3 telnet [...]