Test the preview effect of the .md file

Author: forest512

linuxCheatSheet/openFoam linux cheat sheet.md

@@ -0,0 +1,154 @@
+# OpenFOAM Linux Cheat Sheet
+
+## contents
+1. File & Directory
+2. Text
+3. Binary & Package
+4. Process & Environment
+5. Redirection  
+
+## File & Directory
+**mkdir　  　[OPTION]...  DIRECTORY...**
+* **-p**　  　make parent directories  
+
+```bash
+$ mkdir -p $FOAM_RUN
+```
+
+**cp & mv**　  　**[OPTION]... [-T] SOURCE DEST**
+　  　　  　　  **[OPTION]...SOURCE...DIRECTORY**
+> forest comment: It's really a problem to input the continuous space in Markdown file. In previous contents of this file, as shown above, I use 中文的空格 to creat the multi-space effect. While, maybe there should be some extent before the 中文的空格. This should be discussed.
+
+* **-b**　  　make a backup of each existing destination file
+* **-n**　  　do not overwrite an existing file 
+* **-i**　  　prompt before overwrite
+* **-r**　  　copy(move) directories recursively
+
+```bash
+$ cp -r $FOAM_TUTORIALS . #注意$FOAM_TUTORIALS有个默认的路径，这个意思是把这个目录复制到当前文件下。
+```
+
+**rm**　  　[OPTION]... FILE...
+* **-f**　  　never prompt
+* **-i**　  　prompt before every removal
+* **-r**　  　remove directories recursively  
+
+
+```bash
+$ rm -ri 0\.[^o]*
+```
+
+**ln　  　TARGET... DIRECTORY**
+* **-s**　  　soft link
+
+```bash
+$ ln -s /opt/openfoam30/doc/Guides-a4/UserGuide.pdf ~/Desktop/UserGuide
+```
+
+**touch　  　[OPTION]... FILE...**
+
+```bash
+$ touch cavity.OpenFOAM # 新建一个算例的数据文件，可以用paraview打开。
+```
+
+**chmod　  　[OPTION]...MODE[,MODE]...FILE...
+　  　　  　[OPTION]...OCTAL-MODE FILE...**
+        
+```bash
+$ chmod +x Allrun    # 提高Allrun文件的执行权限
+```
+
+
+
+
+> forest: be added and revised 
+find
+[OPTION] [path…] [expression]
+$ find tutorials/ -name simpleFoam
+locate
+[OPTION]... PATTERN...
+$ locate interPhaseChangeFoam.C
+Text
+echo
+[SHORT-OPTION]... [STRING]...
+ -e
+enable interpretation of backslash escapes
+$ echo -e '\n'$FOAM_SRC'\n'
+less
+[FILE]...
+$ less $WM_PROJECT_DIR/Allwmake
+vi
+[FILE]...
+$ vi ~/.bashrc
+grep
+[OPTIONS] PATTERN [FILE...]
+ -i
+ignore case distinctions in both the  PATTERN and the input files
+ -h
+Suppress the prefixing of file names on  output.
+$ grep -ih build $WM_PROJECT_DIR/Allwmake
+Binary & Package
+whereis
+[-bmsu] filename...
+ -b
+Search only for binaries
+$ whereis -b paraview
+whatis
+name ...
+$ whatis evince
+man
+[OPTION] page…
+$ man chmod
+apropos
+[OPTION] keyword…
+$ apropos plot
+apt-get
+
+ update
+resynchronize the package index files
+ upgrade
+install the newest versions of all packages currently installed on the system
+ install
+install packages
+ remove
+uninstall packages
+$ sudo apt-get install openfoam4
+apt-cache
+
+ search
+perform a full text search on all available package lists
+$ apt-cache search openfoam
+Process & Environment
+ps
+[OPTIONS]
+ -e
+see every process on the system
+$ ps -e
+kill
+[options] <pid> [...]
+ -9
+send SIGKILL
+ -l
+list  signal  names
+$ kill -9 12974
+env
+[OPTION]... [-] [NAME=VALUE]...
+$ env | grep ^FOAM_
+alias
+[-p] [name[=value] ... ]
+$ alias mv='mv -i'
+source
+FILE...
+$ source /opt/openfoam30/etc/bashrc
+Redirection
+command1 > file1
+execute command1, placing the output in file1
+command1 >> file1
+append output to the end of the file
+command1 < file1
+execute command1, with file1 as the source of input
+tr a-z A-Z << END_TEXT
+read from a stream literal
+command1 | command2
+executes command1, using its output as the input for command2
+Copyright © 2016 Zhang Qi