Linux commands -- replace strings in files

Replace the strings in the file with the & mdash; command in Linux. if you want to replace a string in a text file, use the sed command. The following is an example: replace all the desc strings in the testtxt file with helloworld. use the sed Linux command to replace the strings in the file in Linux, to replace a character string in a text file, use the sed command. The following is an example: to replace all the desc strings in the test.txt file with helloworld, use the following command sed "s # desc # helloworld # g" test.txt> test.txt. temp mv test.txt. temp test.txt can be used to replace a string. [Plain] function replacePara () {old = $1 new = $2 file = $3 sed "s # $ old # $ new # g" $ file> $ file. temp mv $ file. temp $ file} then call the replacePara desc helloworld test.txt method to replace all the desc in test.txt with helloworld.