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the-art-of-command-line
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Add new commands. 

Add wc simple description of main selectors and a usage;
Add tee description;
Add socat command;
Add slurm command;
Add rsync command;
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Eduardo Rolim 2015-06-16 11:45:58 -03:00
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1 changed files with 10 additions and 0 deletions
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@ -147,6 +147,10 @@ Scope:
- Know about `cut`, `paste`, and `join` to manipulate text files. Many people use `cut` but forget about `join`. - Know about `cut`, `paste`, and `join` to manipulate text files. Many people use `cut` but forget about `join`.
- Know about `wc` to count newlines (`-l`), characters (`-m`), words (`-w`) and bytes (`-c`).
- Know about `tee` to copy from stdin to a file and also to stdout, as in `ls -al | tee file.txt`.
- Know that locale affects a lot of command line tools in subtle ways, including sorting order (collation) and performance. Most Linux installations will set `LANG` or other locale variables to a local setting like US English. But be aware sorting will change if you change locale. And know i18n routines can make sort or other commands run *many times* slower. In some situations (such as the set operations or uniqueness operations below) you can safely ignore slow i18n routines entirely and use traditional byte-based sort order, using `export LC_ALL=C`. - Know that locale affects a lot of command line tools in subtle ways, including sorting order (collation) and performance. Most Linux installations will set `LANG` or other locale variables to a local setting like US English. But be aware sorting will change if you change locale. And know i18n routines can make sort or other commands run *many times* slower. In some situations (such as the set operations or uniqueness operations below) you can safely ignore slow i18n routines entirely and use traditional byte-based sort order, using `export LC_ALL=C`.
- Know basic `awk` and `sed` for simple data munging. For example, summing all numbers in the third column of a text file: `awk '{ x += $3 } END { print x }'`. This is probably 3X faster and 3X shorter than equivalent Python. - Know basic `awk` and `sed` for simple data munging. For example, summing all numbers in the third column of a text file: `awk '{ x += $3 } END { print x }'`. This is probably 3X faster and 3X shorter than equivalent Python.
@ -309,6 +313,10 @@ A few examples of piecing together commands:
- `nc`: network debugging and data transfer - `nc`: network debugging and data transfer
- `socat`: socket relay and tcp port forwarder (similar to `netcat`)
- `slurm`: network trafic visualization
- `dd`: moving data between files or devices - `dd`: moving data between files or devices
- `file`: identify type of a file - `file`: identify type of a file
@ -345,6 +353,8 @@ A few examples of piecing together commands:
- `cssh`: visual concurrent shell - `cssh`: visual concurrent shell
- `rsync`: sync files and folders over SSH
- `wireshark` and `tshark`: packet capture and network debugging - `wireshark` and `tshark`: packet capture and network debugging
- `host` and `dig`: DNS lookups - `host` and `dig`: DNS lookups