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93 questions linked to/from How to turn off stdout buffering in a pipe?
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6 votes
3 answers
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The following produces nothing in bash: while true ; do upower -d ; sleep 1 ; done | grep percentage | uniq I've discovered that it doesn't matter what the last- or even the second to last- program ...
Parthian Shot's user avatar
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1 vote
1 answer
2k views

I often need to tail -f apache access logs for websites to troubleshoot issues- one thing that makes it annoying is that anyone loading a page once may cause 12+ lines to get written to the log, and ...
Yex's user avatar
  • 13
1 vote
1 answer
2k views

I'm running hostapd on my raspberry PI to let it function as an accesspoint. It's working fine with the following command: sudo hostapd /etc/hostapd/hostapd.conf This will start hostapd and log all ...
swennemen's user avatar
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2 votes
1 answer
1k views

I have a command that processes data slowly. The command processes lines from a file and writes the results to the output file data.txt: my_command > data.txt The issue I have is that I'd like to ...
turtle's user avatar
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0 votes
0 answers
1k views

Lets says I have a file called test.log more rows being added all the time: one|two|apple|four|foo1 one|two|pear|four|foo2 one|two|apple|four|foo3 one|two|peach|four|foo4 I want to tail it but am ...
Felix Eve's user avatar
  • 111
1 vote
1 answer
1k views

I have a script that reads a file that contains urls and then prints out the ip addresses. However, I am unable to find resources as to why the pipe blocks when I add the command cut -d" " -f4 at ...
MykelXIII's user avatar
  • 429
0 votes
0 answers
607 views

How can I save a command output to a file in real-time? For example, if my command is python log.py where log.py contains: import time print('testing') time.sleep(100) # sleeping for 100 seconds and ...
Franck Dernoncourt's user avatar
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1 vote
2 answers
347 views

I'm using locate(1) from GNU findutils for a little task and it seems as if it buffers its output. I am piping the output of locate to another task that will process the lines as locate finds them. ...
mogsie's user avatar
  • 231
1 vote
1 answer
324 views

I am trying to capture mysql traffic and pass those traffic to strings command as follows: tcpdump -i any -s 0 -l -w - dst port 3306 | strings This is working as expected and printing all mysql ...
pradeepchhetri's user avatar
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0 votes
0 answers
360 views

If I call bash like this: bash|sed 's/a/b/g' every time bash outputs an 'a' it is replaced with a 'b' $ bash|sed 's/a/b/g' $ echo aaa bbb $ exit However if I add additional substitutions like so: ...
bananabook's user avatar
  • 102
0 votes
1 answer
322 views

I found out that when I run a command which executes a software that has continuous output lines e.g. traffic monitor like tcpdump or tshark the command keeps counting numbers on screen like 4, 8, 12 ....
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324 views

I need to get a value from a log file which I am getting using awk at the moment. I can get the number printing on the console but when I try to put that value into a new file nothing happens. Here is ...
Owen's user avatar
  • 9
0 votes
1 answer
230 views

When I run sudo wpa_supplicant -Dwext -iwlan3 -cwifi.conf 2>&1 I get: Successfully initialized wpa_supplicant ioctl[SIOCSIWAP]: Operation not permitted ioctl[SIOCSIWENCODEEXT]: Invalid ...
Philip Kirkbride's user avatar
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0 votes
0 answers
113 views

I want to ping a remote system, and have the date show up in my output, and then feed it along the pipeline to another program. I used cat in my examples below only to be a simple example. I can use ...
Zoredache's user avatar
  • 3,810
0 votes
1 answer
114 views

I'm working on a linux pinephone script that would launch a touchpad emulator. In order to do so, I need to compare the output string of: ./TouchpadEmulator /dev/input/event2 /dev/input/event1 once I ...
LostNavigator23's user avatar
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