Bash to Python migration cheat sheet

Explanation	Bash	Python
change directory	cd	os.chdir(“/some/path/”)
print working directory	pwd	os.getdir()
print 4th line	sed -n “4p” somefile	linecache.getline(‘somefile’, 4)
list files	ls	subprocess.call(“ls”, shell=True)
remove/delete a file	rm somefile	subprocess.call(“rm somefile”, shell=True)
print 3rd column in a line	echo ‘this is a line’ | awk ‘{ print $3 }’	“this is a line”.split()[3]
print 3rd column in a file	awk ‘{ print $3 }’ somefile	for line in somefile line.split()[2]