Linux Shell to create recording and playback function scripts

I have seen two very interesting commands script and srciptreplay before, which can record the terminal session to a file. Today I will give you some interesting and meaningful operations.

1. Implementation code

File: Record.sh

#! /bin/bash
# Filename:Record.sh
  
read -p "Please input the sesson filename you want to creat: " filename;
  
sesfile="$filename.session"
logfile="$filename.timing.log"
  
if [ -e $sesfile ];then
  echo "$sesfile is Exsit,Creat session file fault!";
  read -p "If you want to reload the file? [Y/N]: " flag;
  if [ "$flag" = "Y" ];then
    rm $sesfile $logfile;
    script -t 2> $logfile -a $sesfile;
  else
    echo "Nothing to do!";
  fi
    
else
  script -t 2> $logfile -a $sesfile;
fi

File: Replay.sh

#! /bin/bash
# Filename:Replay.sh
  
read -p "Please input the session filename: " filename
logfile="$filename.timing.log"
sesfile="$filename.session"
if [ -e $sesfile ]; then
  scriptreplay $logfile $sesfile
  echo
else
  echo "$filename is NOT Exsit!"
fi

2. Program Analysis

First of all, let’s talk about what these two files are used for. Record.sh is used to record what you execute. commands and screen output, and Replay.sh is used to play back the content recorded by Record.sh.

In Record.sh, you are first asked to enter a file name to save information, such as output, and then create two files in the program. The file names are the file names you entered plus different The suffix is ​​formed, such as output.timing.log and output.session, and then checks whether the input file already exists. If it exists, ask whether to overwrite the old file with the new file. If so, deletethe original If there is a file, create a new file and write data, if not, do no work. Enter a file name in Replay.sh, first determine whether the file exists, and play it if it exists.

In Record.sh, you can see that the script parameters are two files. In order to facilitate identification, I added a specific suffix to the entered file name, even on Linux The file suffix is ​​meaningless. One of the suffixes, .timing.log, is used to store timing information, describing when each command is run. The other file, with the suffix .session, is used to store command output. With these two files, the playback function can be realized. This is a bit like the playback function of the familiar lrc lyrics file under Windows, in my opinion.

Since there are two kinds of output, we need to use data flow redirection to output different output streams into different files. We can also see in Record.sh that we use 2> The information is written to the file *.timing.log through stderr, and the command execution information is written to the file *.session through >.

Replay.sh is relatively simple. It only needs to determine whether the input file exists before it can be played. If you want to play the file created in Record.sh above, you only need to enter output.

# I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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