alternative to `tail -f ` allowing printing continuous stream from multiple files in multiple folders under...

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This question already has an answer here:

How to tail multiple files using tail -0f in Linux/AIX

7 answers

As far as I know, tail -f <filename> allows to continuously print newly appended data from one single file.

What if I need to get content from multiple files located in multiple folders under the same parent folder, then filter that content if need be, and finally print it as a real-time stream, as new data gets appended to any one of the multiple monitored files?

EDIT: the operating system is RedHat Enterprise Linux 7.4

edited Dec 4 at 18:10

asked Dec 4 at 14:11

KiriSakow

marked as duplicate by Stephen Kitt, Jeff Schaller, Christopher, RalfFriedl, thrig Dec 5 at 0:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Did you search for multitail?
– Kusalananda
Dec 4 at 14:13

@StéphaneChazelas RedHat 7.4
– KiriSakow
Dec 4 at 17:57

1

Are new files or directories being created/removed there while you're tailing that folder? If yes, should they be dynamically added to the list of files to monitor? May there be hard links or symlinks?
– Stéphane Chazelas
Dec 4 at 18:01

@StéphaneChazelas yes indeed new folders with new files are dynamically added, and these new ones are to be monitored too. Please take a look at my own answer below and tell me what you think.
– KiriSakow
Dec 4 at 18:07

add a comment |

up vote
0
down vote

favorite

This question already has an answer here:

How to tail multiple files using tail -0f in Linux/AIX

7 answers

As far as I know, tail -f <filename> allows to continuously print newly appended data from one single file.

EDIT: the operating system is RedHat Enterprise Linux 7.4

edited Dec 4 at 18:10

asked Dec 4 at 14:11

KiriSakow

marked as duplicate by Stephen Kitt, Jeff Schaller, Christopher, RalfFriedl, thrig Dec 5 at 0:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Did you search for multitail?
– Kusalananda
Dec 4 at 14:13

@StéphaneChazelas RedHat 7.4
– KiriSakow
Dec 4 at 17:57

1

Are new files or directories being created/removed there while you're tailing that folder? If yes, should they be dynamically added to the list of files to monitor? May there be hard links or symlinks?
– Stéphane Chazelas
Dec 4 at 18:01

@StéphaneChazelas yes indeed new folders with new files are dynamically added, and these new ones are to be monitored too. Please take a look at my own answer below and tell me what you think.
– KiriSakow
Dec 4 at 18:07

add a comment |

up vote
0
down vote

favorite

This question already has an answer here:

How to tail multiple files using tail -0f in Linux/AIX

7 answers

As far as I know, tail -f <filename> allows to continuously print newly appended data from one single file.

EDIT: the operating system is RedHat Enterprise Linux 7.4

edited Dec 4 at 18:10

asked Dec 4 at 14:11

KiriSakow

This question already has an answer here:

How to tail multiple files using tail -0f in Linux/AIX

7 answers

As far as I know, tail -f <filename> allows to continuously print newly appended data from one single file.

EDIT: the operating system is RedHat Enterprise Linux 7.4

This question already has an answer here:

How to tail multiple files using tail -0f in Linux/AIX

7 answers

rhel tail

edited Dec 4 at 18:10

asked Dec 4 at 14:11

KiriSakow

edited Dec 4 at 18:10

asked Dec 4 at 14:11

KiriSakow

edited Dec 4 at 18:10

asked Dec 4 at 14:11

KiriSakow

asked Dec 4 at 14:11

KiriSakow

asked Dec 4 at 14:11

KiriSakow

marked as duplicate by Stephen Kitt, Jeff Schaller, Christopher, RalfFriedl, thrig Dec 5 at 0:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

marked as duplicate by Stephen Kitt, Jeff Schaller, Christopher, RalfFriedl, thrig Dec 5 at 0:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Did you search for multitail?
– Kusalananda
Dec 4 at 14:13

@StéphaneChazelas RedHat 7.4
– KiriSakow
Dec 4 at 17:57

1

Are new files or directories being created/removed there while you're tailing that folder? If yes, should they be dynamically added to the list of files to monitor? May there be hard links or symlinks?
– Stéphane Chazelas
Dec 4 at 18:01

@StéphaneChazelas yes indeed new folders with new files are dynamically added, and these new ones are to be monitored too. Please take a look at my own answer below and tell me what you think.
– KiriSakow
Dec 4 at 18:07

add a comment |

Did you search for multitail?
– Kusalananda
Dec 4 at 14:13

@StéphaneChazelas RedHat 7.4
– KiriSakow
Dec 4 at 17:57

1

Are new files or directories being created/removed there while you're tailing that folder? If yes, should they be dynamically added to the list of files to monitor? May there be hard links or symlinks?
– Stéphane Chazelas
Dec 4 at 18:01

@StéphaneChazelas yes indeed new folders with new files are dynamically added, and these new ones are to be monitored too. Please take a look at my own answer below and tell me what you think.
– KiriSakow
Dec 4 at 18:07

Did you search for multitail?
– Kusalananda
Dec 4 at 14:13

@StéphaneChazelas RedHat 7.4
– KiriSakow
Dec 4 at 17:57

Are new files or directories being created/removed there while you're tailing that folder? If yes, should they be dynamically added to the list of files to monitor? May there be hard links or symlinks?
– Stéphane Chazelas
Dec 4 at 18:01

@StéphaneChazelas yes indeed new folders with new files are dynamically added, and these new ones are to be monitored too. Please take a look at my own answer below and tell me what you think.
– KiriSakow
Dec 4 at 18:07

add a comment |

2 Answers
2

active

oldest

votes

up vote
0
down vote

accepted

Use the following oneliner:

while true; do cat /path/to/numerous/folders/and/files/*/*.txt | grep "some filter" | tail -n 10; sleep 1; done

Every 1 second, the script will print 10 last lines of the filtered stream.

To break the loop, press CtrlC.

answered Dec 4 at 14:15

KiriSakow

Is this really what you wanted? Unlike tail -f, it will repeat the same lines over and over if there is no change, and can miss lines if more than 10 lines are added to a file in the 1-second window.
– n.st
Dec 4 at 23:18

@n.st This oneliner did the job pretty well so far. At least for the time being.
– KiriSakow
Dec 4 at 23:43

add a comment |

up vote
-1
down vote

Try this command:

ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname & done; wait

edited Dec 4 at 15:13

roaima

42.5k551116

answered Dec 4 at 14:28

Alireza Kazemi

There was a typo: ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname &; done
– Alireza Kazemi
Dec 4 at 14:30

1

Please edit your answer to fix the typo. You don't need to comment on it.
– roaima
Dec 4 at 15:12

add a comment |

2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
0
down vote

accepted

Use the following oneliner:

while true; do cat /path/to/numerous/folders/and/files/*/*.txt | grep "some filter" | tail -n 10; sleep 1; done

Every 1 second, the script will print 10 last lines of the filtered stream.

To break the loop, press CtrlC.

answered Dec 4 at 14:15

KiriSakow

Is this really what you wanted? Unlike tail -f, it will repeat the same lines over and over if there is no change, and can miss lines if more than 10 lines are added to a file in the 1-second window.
– n.st
Dec 4 at 23:18

@n.st This oneliner did the job pretty well so far. At least for the time being.
– KiriSakow
Dec 4 at 23:43

add a comment |

up vote
0
down vote

accepted

Use the following oneliner:

while true; do cat /path/to/numerous/folders/and/files/*/*.txt | grep "some filter" | tail -n 10; sleep 1; done

Every 1 second, the script will print 10 last lines of the filtered stream.

To break the loop, press CtrlC.

answered Dec 4 at 14:15

KiriSakow

Is this really what you wanted? Unlike tail -f, it will repeat the same lines over and over if there is no change, and can miss lines if more than 10 lines are added to a file in the 1-second window.
– n.st
Dec 4 at 23:18

@n.st This oneliner did the job pretty well so far. At least for the time being.
– KiriSakow
Dec 4 at 23:43

add a comment |

up vote
0
down vote

accepted

Use the following oneliner:

while true; do cat /path/to/numerous/folders/and/files/*/*.txt | grep "some filter" | tail -n 10; sleep 1; done

Every 1 second, the script will print 10 last lines of the filtered stream.

To break the loop, press CtrlC.

answered Dec 4 at 14:15

KiriSakow

Use the following oneliner:

while true; do cat /path/to/numerous/folders/and/files/*/*.txt | grep "some filter" | tail -n 10; sleep 1; done

Every 1 second, the script will print 10 last lines of the filtered stream.

To break the loop, press CtrlC.

answered Dec 4 at 14:15

KiriSakow

answered Dec 4 at 14:15

KiriSakow

answered Dec 4 at 14:15

KiriSakow

answered Dec 4 at 14:15

KiriSakow

Is this really what you wanted? Unlike tail -f, it will repeat the same lines over and over if there is no change, and can miss lines if more than 10 lines are added to a file in the 1-second window.
– n.st
Dec 4 at 23:18

@n.st This oneliner did the job pretty well so far. At least for the time being.
– KiriSakow
Dec 4 at 23:43

add a comment |

Is this really what you wanted? Unlike tail -f, it will repeat the same lines over and over if there is no change, and can miss lines if more than 10 lines are added to a file in the 1-second window.
– n.st
Dec 4 at 23:18

@n.st This oneliner did the job pretty well so far. At least for the time being.
– KiriSakow
Dec 4 at 23:43

Is this really what you wanted? Unlike tail -f, it will repeat the same lines over and over if there is no change, and can miss lines if more than 10 lines are added to a file in the 1-second window.
– n.st
Dec 4 at 23:18

@n.st This oneliner did the job pretty well so far. At least for the time being.
– KiriSakow
Dec 4 at 23:43

add a comment |

up vote
-1
down vote

Try this command:

ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname & done; wait

edited Dec 4 at 15:13

roaima

42.5k551116

answered Dec 4 at 14:28

Alireza Kazemi

There was a typo: ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname &; done
– Alireza Kazemi
Dec 4 at 14:30

1

Please edit your answer to fix the typo. You don't need to comment on it.
– roaima
Dec 4 at 15:12

add a comment |

up vote
-1
down vote

Try this command:

ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname & done; wait

edited Dec 4 at 15:13

roaima

42.5k551116

answered Dec 4 at 14:28

Alireza Kazemi

There was a typo: ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname &; done
– Alireza Kazemi
Dec 4 at 14:30

1

Please edit your answer to fix the typo. You don't need to comment on it.
– roaima
Dec 4 at 15:12

add a comment |

up vote
-1
down vote

Try this command:

ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname & done; wait

edited Dec 4 at 15:13

roaima

42.5k551116

answered Dec 4 at 14:28

Alireza Kazemi

Try this command:

ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname & done; wait

edited Dec 4 at 15:13

roaima

42.5k551116

answered Dec 4 at 14:28

Alireza Kazemi

edited Dec 4 at 15:13

roaima

42.5k551116

edited Dec 4 at 15:13

roaima

42.5k551116

edited Dec 4 at 15:13

roaima

42.5k551116

answered Dec 4 at 14:28

Alireza Kazemi

answered Dec 4 at 14:28

Alireza Kazemi

answered Dec 4 at 14:28

Alireza Kazemi

There was a typo: ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname &; done
– Alireza Kazemi
Dec 4 at 14:30

1

Please edit your answer to fix the typo. You don't need to comment on it.
– roaima
Dec 4 at 15:12

add a comment |

There was a typo: ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname &; done
– Alireza Kazemi
Dec 4 at 14:30

1

Please edit your answer to fix the typo. You don't need to comment on it.
– roaima
Dec 4 at 15:12

There was a typo: ls /path/to/files/to/be/monitored/by/tail | while read fname; do tail -f $fname &; done
– Alireza Kazemi
Dec 4 at 14:30

Please edit your answer to fix the typo. You don't need to comment on it.
– roaima
Dec 4 at 15:12

add a comment |

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