How to check syslog in Bash on Linux

Question

In C we log this way   syslog  LOG INFO   proxying  s   url      In Linux how can we check the log

User · Answer

On Fedora 19  it looks like the answer is  var log messages  Although check  etc rsyslog conf if it has been changed

User · Answer

tail -f  var log syslog   grep process name where process name is the name of the process we are interested in

User · Answer

How about less  var log syslog

User · Answer

By default it s logged into system log at  var log syslog  so it can be read by   tail -f  var log syslog   If the file doesn t exist  check  etc syslog conf to see configuration file for syslogd  Note that the configuration file could be different  so check the running process if it s using different file     ps wuax   grep syslog root       sbin syslogd -f  etc syslog-knoppix conf   Note  In some distributions  such as Knoppix  all logged messages could be sent into different terminal  e g   dev tty12   so to access e g  tty12 try  pressing Control Alt F12   You can also use lsof tool to find out which log file the syslogd process is using  e g   sudo lsof -p   pgrep syslog    grep log       To send the test message to syslogd in shell  you may try   echo test   logger     For troubleshooting use a trace tool  strace on Linux  dtruss on Unix   e g    sudo strace -fp   cat  var run syslogd pid

User · Answer

If you like Vim  it has built-in syntax highlighting for the syslog file  e g  it will highlight error messages in red   vi   syntax on   var log syslog

User · Answer

A very cool util is journalctl    For example  to show syslog to console  journalctl -t  lt syslog-ident gt   where  lt syslog-ident gt  is identity you gave to function openlog to initialize syslog

[linux] How to check syslog in Bash on Linux?

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