Simple web server - the right escape sequences, so youdon t have to
the right escape sequences, so youdon t have to spend time looking them up. The blue prompt in the preceding example looks likethis when you use tput: [freddie@bastille] BLUE=$(tput setaf 4) [freddie@bastille] BLACK=$(tput setaf 0) [freddie@bastille] PS1= \[$BLUE\]\u@\h]\ [$BLACK\] [freddie@bastille] The first line uses tputto find the character sequencethat changes the foreground color to blue. The sec- ond line finds the character sequence that changesthe foreground color to black. Notice that you don tneed to know the magic escape sequences; tputkeeps a database of terminal descriptions and con- sults that database to find the sequence that corre- sponds to the terminal (or terminal emulator) you reusing. The third line patches the $BLUEand $BLACKsequences into the $PS1prompt string. The $PS1string, however, is still more complicatedthan it needs to be it s got a few extra \[and \] sequences. Those extra characters are required sothat bash knows which prompt characters take upscreen real estate and which ones don t (the invisiblecharacters must appear between a \[and \]pair). When you use tput, you can clean up extracharacters a bit more by including those extracharacters in the $BLUEand $BLACKvariables: [freddie@bastille] BLUE= \[$(tput setaf4)\] [freddie@bastille] BLACK= \[$(tput setaf0)\] [freddie@bastille] PS1= $BLUE\u@\h]$BLACK [freddie@bastille] tputcan do much more than just change the foregroundcolor of the prompt. Table 4-2 shows a few of the more use- ful tputsequences. (For a complete list, see man tputandman terminfo.) Colorizing Your PromptChanging the color of your prompt may not save youtons of time, but it can make the prompt more read- able and convey extra information without taking upscreen real estate. What kind of information can you encode withcolorized prompts? Just about anything. Turnyour prompt green when you re logged intoone host and blue when you re logged intoanother. Display your prompt in green whenthe system load is low, yellow as it increases, and red when you re running into resourcebottlenecks. Or, just change the color of yourprompt to a fixed color so that it stands out onthe screen. You can colorize your prompt two ways. The mostcommon (but not the most timesaving) way is toinclude special escape characters (characters thatyour terminal window understands, but humansdon t) in your prompt. For example, the followingstring turns your prompt blue: [freddie@bastille] PS1= \[\033[0;34m\] [\u@\h]\[\033[0m\] [freddie@bastille] Of course, because this is a black-and-white book, youcan t see the color here, but if you try this example, you ll see that the prompt turns blue. This methodworks, but it has two drawbacks. First, the syntax ishard to read (and hard to get right in the first place). Second, this method works only if your terminalemulator supports ANSI escape sequences manyterminal emulators (and many terminals) don t. Fortunately, you can fix both problems at once byusing tput. When changing the color of your prompt, usingtputmakes your prompts portable. That is, ifyou move to another terminal emulator, youdon t have to change prompts. tputalso07
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