Commands by 6bc98f7f

Commands by 6bc98f7f (6)

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ping as traceroute

This command uses ping to get the routers' IP addresses to the destination host as traceroute does. If you know what I mean..
This is sample output - yours may be different.
12

for i in {1..30}; do ping -t $i -c 1 google.com; done | grep "Time to live exceeded"

6bc98f7f · 2012-02-19 13:37:04 4

Indent a one-liner.

Bash builtin type also indents the function. Show Sample Output

type <function name>

6bc98f7f · 2011-04-09 15:33:40 0

-P uses the POSIX output format, which makes information on each file system always printed on exactly one line. "column -t" makes a table from the input. Show Sample Output

df -P | column -t

6bc98f7f · 2011-04-09 13:12:46 5

Start vim without initialization

This will skip all initializations. Especially useful when your ~/.vimrc has something wrong.
This is sample output - yours may be different.
3

vim -u NONE yourfile

6bc98f7f · 2011-03-29 01:31:10 0
count processes with status

Use ps instead of top. But do not use BSD options at all, they are confusing. Use "s=" or "state=" to show consice process statuses. Show Sample Output
This is sample output - yours may be different.
```
$ ps -eo stat= | sort | uniq -c | sort -n
      1 R+
      1 SL
      1 SLl
      1 SN
      1 SNl
      1 S<s
      1 S<sl
      4 S<
      5 S+
      6 Ssl
      9 Ss+
     14 Ss
     40 Sl
    115 S
```
0

ps -eo stat= | sort | uniq -c | sort -n

6bc98f7f · 2011-03-25 13:01:42 0
List your MACs address

The output of ifconfig is localized, using it will fail in non-English environment. "ip" command in iproute2 provides a consistent output and thus is more robust Show Sample Output
This is sample output - yours may be different.
3

ip link | awk '/link/ {print $2}'

6bc98f7f · 2011-03-25 06:26:08 0

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Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

copy/mkdir and automatically create parent directories

The --parents option will cause cp or mkdir to automatically create the parent directory structure. $mkdir --parents /one/two/three/dir will create /one, /one/two, and /one/two/three as needed before creating dir. cp will copy files with their full directory structure into the target directory with this option. Thanks to Peter Leung at: http://linuxcommando.blogspot.com/2007/11/use-of-parents-flag-in-mkdir-and-c.html which has good examples of usage.

find out how much space are occuipied by files smaller than 1024K

The command gives size of all files smaller than 1024k, this information, together with disk usage, can help determin file system parameter (e.g. block size) or storage device (e.g. SSD v.s. HDD). Note if you use awk instead of "cut| dc", you easily breach maximum allowed number of records in awk.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Generic shell function for modifying files in-place

Some commands (such as sed and perl) have options to support in-place editing of files, but many commands do not. This shell function enables any command to change files in place. See the sample output for many examples. The function uses plain sh syntax and works with any POSIX shell or derivative, including zsh and bash.

Quick access to ASCII code of a key

Show errors in the kernel ring buffer

Much more useful then parsing syslog

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Rename files in batch

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

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