# Commands Summary

| Unix                             | Powershell                                                                                |
| -------------------------------- | ----------------------------------------------------------------------------------------- |
| alias (set aliases)              | set-alias                                                                                 |
| alias (show aliases)             | get-alias                                                                                 |
| apropos                          | get-help                                                                                  |
| basename                         | dir \| select name                                                                        |
| cal                              | See commands detail                                                                       |
| cd                               | cd                                                                                        |
| clear                            | clear-host                                                                                |
| date                             | get-date                                                                                  |
| date -s                          | set-date                                                                                  |
| df -k                            | Get-WMIObject Win32\_LogicalDisk \| ft -a                                                 |
| diff                             | Compare-Object -ReferenceObject (Get-Content file1) -DifferenceObject (Get-Content file2) |
| dirname                          | dir \| select directory                                                                   |
| du                               | See commands detail                                                                       |
| echo                             | write-output                                                                              |
| echo -n                          | write-host -nonewline                                                                     |
| \| egrep -i sql                  | \| where {\[Regex]::Ismatch($\_.name.tolower(), "sql") }                                  |
| egrep -i                         | select-string                                                                             |
| egrep                            | select-string  -casesensitive                                                             |
| egrep -v                         | select-string -notmatch                                                                   |
| env                              | Get-ChildItem Env: \| fl  or  get-variable                                                |
| errpt                            | get-eventlog                                                                              |
| export PS1="$ "                  | function prompt {"$ " }                                                                   |
| find                             | dir  *whatever* -recurse                                                                  |
| for (start, stop, step)          | for ($i = 1; $i -le 5; $i++) {whatever}                                                   |
| head                             | gc file.txt \| select-object -first 10                                                    |
| history                          | get-history                                                                               |
| history \| egrep -i ls           | history \| select commandline \| where commandline -like '*ls*' \| fl                     |
| hostname                         | hostname                                                                                  |
| if-then-else                     | if  ( condition ) { do-this } elseif { do-that } else {do-theother}                       |
| if \[ -f "$FileName" ]           | if (test-path $FileName)                                                                  |
| kill                             | stop-process                                                                              |
| less                             | more                                                                                      |
| locate                           | no equivalent but see link                                                                |
| ls                               | get-childitem OR gci OR dir OR ls                                                         |
| ls -a                            | ls -force                                                                                 |
| lsusb                            | gwmi Win32\_USBControllerDevice                                                           |
| mailx                            | send-mailmessage                                                                          |
| man                              | get-help                                                                                  |
| more                             | more                                                                                      |
| mv                               | rename-item                                                                               |
| pg                               | more                                                                                      |
| ps -ef                           | get-process                                                                               |
| ps -ef \| grep oracle            | get-process oracle                                                                        |
| pwd                              | get-location                                                                              |
| read                             | read-host                                                                                 |
| rm                               | remove-item                                                                               |
| script                           | start-transcript                                                                          |
| sleep                            | start-sleep                                                                               |
| sort                             | sort-object                                                                               |
| sort -uniq                       | get-unique                                                                                |
| tail                             | gc file.txt \| select-object -last 10                                                     |
| tail -f                          | gc -tail 10 -wait file.txt                                                                |
| time                             | measure-command                                                                           |
| touch - create an empty file     | set-content -Path ./file.txt -Value $null                                                 |
| touch - update the modified date | set-itemproperty -path ./file.txt -name LastWriteTime -value $(get-date)                  |
| wc -l                            | gc ./file.txt \| measure-object \| select count                                           |
| whoami                           | \[Security.Principal.WindowsIdentity]::GetCurrent() \| select name                        |
| whence or type                   | No direct equivalent, but see link                                                        |
| unalias                          | remove-item -path alias:aliasname                                                         |
| uname -m                         | Get-WmiObject -Class Win32\_ComputerSystem \| select manufacturer, model                  |
| uptime                           | get-wmiobject -class win32\_operatingsystem \| select LastBootUpTime                      |
| (line continuation)              | \` (a backtick)                                                                           |