风焱

User Commands                                               if(1) NAME     if, test  -  evaluate  condition(s)  or  make  execution  of     actions dependent upon the evaluation of condition(s)S

User Commands                                               sh(1) NAME     sh, jsh - standard and job control shell and command  inter-     preterSYNOPSIS     /usr/bin/sh [ -acefhiknprstuvx ]  [