deletions | additions       diff --git a/General Notes on Bioinformatics.md b/General Notes on Bioinformatics.md  index e6d9767..e3e6271 100644  --- a/General Notes on Bioinformatics.md  +++ b/General Notes on Bioinformatics.md 
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##Summary of commands and terms  $ **ls** lists files and directories (folders). If left as just "ls" it this command  will list the files and directories in your current location. If a "path" is added afterwards (e.g., ls /usr) it this command  will list the files and directories in that location. $ **cd** use to change directories 
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$ **cd ~** use to move to the home directory of the current user   $ **grep "some pattern" file_name** displays lines that match the pattern (contained within the quotes) for which  you are looking for. searching.  If a line contains the same character multiple times it will only be displayed once. $ **grep –c “what you want to count” file_name** counts the number of lines containing a specific character or sequence of characters 
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##Software updates  Software packages are updated with varying frequencies. Some software such  updates will render the instructions offered here obsolete. When this occurs, you should consult with the software manual for help. An internet search with a description of the problem you are having may prove helpful. Another option is to email the software developer; many are remarkably responsive. As a last resort, consult with a colleague who is more comfortable with bioinformatics. bioinformatics or computer programming.  It is customary to offer a small favor or gift. Most software updates will require only minor modifications. For example, we might provide you with instructions to type: ./software_1.2.0/software.py  but a more recent release might necessitate: