bash - what does -s option mean in GNU sed? -


i have read sed manual -s option. there says:

-s --separate default, sed consider files specified on command line single continuous long stream. gnu sed extension allows user consider them separate files: range addresses (such ‘/abc/,/def/’) not allowed span several files, line numbers relative start of each file, $ refers last line of each file, , files invoked r commands rewound @ start of each file.

add -s , no -s in same

[root@kvm ~]# cat 1 |sed -s   -n '/1/p' 12345a6789a99999a 12345a6789a99999b  [root@kvm ~]# cat 1 |sed     -n '/1/p' 12345a6789a99999a 12345a6789a99999b  1 file  cat 1 12345a6789a99999a 12345a6789a99999b

how use -s ?

it matters if give sed multiple files.

if don't specify -s flag, sed act if files contents had been concatenated in single stream :

echo "123 456 789" > file1 echo "abc def ghi" > file2  # input files considered single stream of 6 lines, second fourth printed sed -n '2,4 p' file1 file2   456    # stream 1, line 2 789    # stream 1, line 3 abc    # stream 1, line 4   # there 2 distinct streams of 3 lines 2nd , 3rd of each printed sed -ns '2,4 p' file1 file2  456    # stream 1, line 2 789    # stream 1, line 3 def    # stream 2, line 2 ghi    # stream 2, line 3

-

Comments

Post a Comment

Popular posts from this blog

amazon web services - S3 Pre-signed POST validate file type? -

i know it's possible put limit on file size content-length-range header. possible validate file type? https://docs.aws.amazon.com/amazons3/latest/dev/httppostforms.html#policyconditions i see there content-type header, if set say, audio/mp3 allow mp3 files , return error if file not mp3? i found previous question answers mention validating file size: s3 direct upload restricting file size , type you can specify content-type @ post request. you can specify @ signature, post must done content-type: { "expiration": "2007-12-01t12:00:00.000z", "conditions": [ {"acl": "public-read" }, {"bucket": "johnsmith" }, {"content-type: "audio/mp3"} ] } creating html form (using aws signature version 4) edit: @ previous question found, checking content-type.
Read more

c# - Check Keyboard Input Winforms -

i wondering if instead of doing this protected override void onkeydown(keyeventargs e) { if (e.keycode == keys.a) console.writeline("the key down."); } i set bool method , this: if(keydown(keys.a)) // whatever here i've been sitting here ages trying figure out how it. can't wrap head around it. in case wondering, plan call bool inside different method, check input. since want perform action after pressing key, using keydown event enough. but in cases suppose want check if specific key down in middle of process, can use getkeystate method way: [dllimport("user32.dll", charset = charset.auto, exactspelling = true)] public static extern short getkeystate(int keycode); public const int key_pressed = 0x8000; public static bool iskeydown(keys key) { return convert.toboolean(getkeystate((int)key) & key_pressed); } you should know, each time check key state using example iskeydown(keys.a) method returns true if ke...
Read more