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Diffstat (limited to 'shell-workshop/session.txt')
| -rw-r--r-- | shell-workshop/session.txt | 381 |
1 files changed, 0 insertions, 381 deletions
diff --git a/shell-workshop/session.txt b/shell-workshop/session.txt deleted file mode 100644 index 234c240..0000000 --- a/shell-workshop/session.txt +++ /dev/null @@ -1,381 +0,0 @@ -Shell Input ------------ - - sh@sleipnir1:~$ vim hello.sh - sh@sleipnir1:~$ cat hello.sh - echo Hello world - sh@sleipnir1:~$ sh hello.sh - Hello world - sh@sleipnir1:~$ sh -c 'echo Hello world' - Hello world - sh@sleipnir1:~$ echo Hello world - Hello world - -Comments, Magic Number Behavior, and File Modes ------------------------------------------------ - - sh@sleipnir1:~$ vim hello.sh - sh@sleipnir1:~$ cat hello.sh - #! /bin/sh - # This is a comment - echo Hello world - sh@sleipnir1:~$ ./hello.sh - -su: ./hello.sh: Permission denied - sh@sleipnir1:~$ ls -l hello.sh - -rw-r--r-- 1 sh sh 48 Mar 30 13:26 hello.sh - sh@sleipnir1:~$ chmod a+x hello.sh - sh@sleipnir1:~$ ls -l hello.sh - -rwxr-xr-x 1 sh sh 48 Mar 30 13:26 hello.sh - sh@sleipnir1:~$ ./hello.sh - Hello world - -Field Splitting and Quoting ---------------------------- - - sh@sleipnir1:~$ mkdir foo bar - sh@sleipnir1:~$ ls - bar foo hello.sh - sh@sleipnir1:~$ rmdir foo bar - sh@sleipnir1:~$ mkdir foo\ bar - sh@sleipnir1:~$ ls - foo bar hello.sh - sh@sleipnir1:~$ rmdir foo\ bar - sh@sleipnir1:~$ ls - hello.sh - sh@sleipnir1:~$ mkdir 'foo bar - > baz' - sh@sleipnir1:~$ ls - foo bar?baz hello.sh - sh@sleipnir1:~$ rmdir 'foo bar - > baz' - sh@sleipnir1:~$ ls - hello.sh - sh@sleipnir1:~$ mkdir "foo bar baz" - sh@sleipnir1:~$ ls - foo bar baz hello.sh - -Tilde Expansion ---------------- - - sh@sleipnir1:~$ echo ~ - /home/sh - sh@sleipnir1:~$ ls ~sh-foo - another-directory another-file bar baz foo some-directory some-file - sh@sleipnir1:~$ ls ~sh-foo/some-directory - Hey, this is a cool file! - -Pathname Expansion ------------------- - - sh@sleipnir1:~$ echo ~sh-foo/*-file - /home/sh-foo/another-file /home/sh-foo/some-file - sh@sleipnir1:~$ echo ~sh-foo/ba*/file - /home/sh-foo/bar/file /home/sh-foo/baz/file - sh@sleipnir1:~$ echo ~sh-foo/ba[a-r]/file - /home/sh-foo/bar/file - sh@sleipnir1:~$ echo ~sh-foo/ba[p-z]/file - /home/sh-foo/bar/file /home/sh-foo/baz/file - -Parameter Assignment --------------------- - - sh@sleipnir1:~$ myparam=foo - sh@sleipnir1:~$ mynum=1 - -Parameter Expansion -------------------- - - sh@sleipnir1:~$ echo ${myparam} - foo - sh@sleipnir1:~$ echo ${nullparam:-default} - default - sh@sleipnir1:~$ echo ${#myparam} - 3 - sh@sleipnir1:~$ file=main.c - sh@sleipnir1:~$ echo ${file%.c}.o - main.o - sh@sleipnir1:~$ dir=foo/bar/baz - sh@sleipnir1:~$ echo ${dir##*/} - baz - -Positional Parameters ---------------------- - - sh@sleipnir1:~$ vim pos-params.sh - sh@sleipnir1:~$ cat pos-params.sh - #! /bin/sh - echo ${1} - echo ${2} - sh@sleipnir1:~$ chmod a+x pos-params.sh - sh@sleipnir1:~$ ./pos-params.sh foo - foo - - sh@sleipnir1:~$ sh pos-params.sh foo bar baz - foo - bar - -Special Parameters ------------------- - - sh@sleipnir1:~$ vim spec-params.sh - sh@sleipnir1:~$ cat spec-params.sh - #! /bin/sh - - echo Number of positional parameters: ${#} - echo Positional parameters: ${@} - echo Script name: ${0} - sh@sleipnir1:~$ sh spec-params.sh foo bar baz - Number of positional parameters: 3 - Positional parameters: foo bar baz - Script name: spec-params.sh - -Exit Statuses -------------- - - sh@sleipnir1:~$ vim spec-params.sh - sh@sleipnir1:~$ cat spec-params.sh - #! /bin/sh - - echo Number of positional parameters: ${#} - echo Positional parameters: ${@} - echo Script name: ${0} - true - echo ${?} - false - echo ${?} - sh@sleipnir1:~$ sh spec-params.sh foo bar baz - Number of positional parameters: 3 - Positional parameters: foo bar baz - Script name: spec-params.sh - 0 - 1 - -Shell Variables and Links `.` and `..` --------------------------------------- - - sh@sleipnir1:~$ echo ${HOME} - /home/sh - sh@sleipnir1:~$ echo ${PWD} - /home/sh - sh@sleipnir1:~$ ls - foo bar baz hello.sh pos-params.sh spec-params.sh - sh@sleipnir1:~$ cd foo\ bar\ baz/ - sh@sleipnir1:~/foo bar baz$ echo ${PWD} - /home/sh/foo bar baz - sh@sleipnir1:~/foo bar baz$ ls . - sh@sleipnir1:~/foo bar baz$ mkdir file1 file2 - sh@sleipnir1:~/foo bar baz$ ls . - file1 file2 - sh@sleipnir1:~/foo bar baz$ ls .. - foo bar baz hello.sh pos-params.sh spec-params.sh - sh@sleipnir1:~/foo bar baz$ cd .. - sh@sleipnir1:~$ echo ${PWD} - /home/sh - sh@sleipnir1:~$ PS1='$ ' - $ PS1='PROMPT> ' - PROMPT> echo Hello - Hello - PROMPT> PS1='$ ' - $ echo Hello \ - > World - Hello World - -Command Substitution --------------------- - - $ filepath=$(basename ~sh-foo/bar/file) - $ echo ${filepath} - file - -Arithmetic Expansion --------------------- - - $ echo $((2+3)) - 5 - $ echo $((0x10 + 4)) - 20 - $ i=0 - $ i=$(($i + 1)) - $ echo ${i} - 1 - $ i=$(($i + 1)) - $ echo ${i} - 2 - $ i=$(($i + 1)) - $ echo ${i} - 3 - -Simple Commands ---------------- - - $ i=0 echo Hello - Hello - -Command Search and Execution ----------------------------- - - $ echo ${PATH} - /usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games - $ ./hello.sh - Hello world - $ hello.sh - -su: hello.sh: command not found - $ ls - foo bar baz hello.sh pos-params.sh spec-params.sh - $ PATH=${PATH}:${HOME} - $ echo ${PATH} - /usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/home/sh - $ hello.sh - Hello world - -Pipelines ---------- - - $ ! true - $ echo ${?} - 1 - $ ! false - $ echo ${?} - 0 - $ true - $ echo ${?} - 0 - $ false - $ echo ${?} - 1 - -Lists ------ - - $ false && echo foo || echo bar - bar - $ true || echo foo && echo bar - bar - -`test` Command and `if` Construct ---------------------------------- - - $ [ foo = foo ] && echo equal || echo not equal - equal - $ if [ foo = foo ]; then echo equal else echo not equal; fi - equal else echo not equal - $ if [ foo = foo ]; then echo equal; else echo not equal; fi - equal - $ if [ foo = foo ]; then - > echo equal - > else - > echo not equal - > fi - equal - -`while` Loop ------------- - - $ i=0 - $ while [ ${i} -lt 5 ]; do - > echo ${i} - > i=$(($i + 1)) - > done - 0 - 1 - 2 - 3 - 4 - $ vim param-loop.sh - $ cat param-loop.sh - while [ ${#} -gt 0 ]; do - echo Parameter: ${1} - shift - done - $ sh param-loop.sh foo bar baz - Parameter: foo - Parameter: bar - Parameter: baz - -`for` Loop ----------- - - $ for param in foo bar baz; do - > echo ${param} - > done - foo - bar - baz - -`case` Construct ----------------- - - $ param=foo - $ case ${param} in - > f*) - > echo starts with f - > ;; - > b*) - > echo starts with b - > ;; - > esac - starts with f - -Functions ---------- - - $ print_hello() - > { - > echo Hello world - > } - $ print_hello - Hello world - $ print_params() - > { - > echo ${@} - > } - $ print_params 1 2 3 - 1 2 3 - -Input/Output Redirection ------------------------- - - $ echo Hello world > hello-file - $ cat hello-file - Hello world - $ echo Hello world > hello-file - $ echo Hello world > hello-file - $ echo Hello world > hello-file - $ cat hello-file - Hello world - $ echo Hello world >> hello-file - $ echo Hello world >> hello-file - $ cat hello-file - Hello world - Hello world - Hello world - $ vim read-file.sh - $ cat read-file.sh - while read line; do - echo Line: ${line} - done < myfile.txt - $ sh read-file.sh - Line: line one - Line: line two - Line: some other line - $ vim read-file.sh - $ cat read-file.sh - while read field1 field2; do - echo Line: ${field1}, ${field2} - done < myfile.txt - $ sh read-file.sh - Line: line, one - Line: line, two - Line: some, other line - $ echo Hello world > /dev/null - $ sh -c not-a-command - sh: 1: not-a-command: not found - $ sh -c not-a-command 2> /dev/null - $ while read line; do - > echo Line: ${line} - > done <<EOF - > this is input - > some more input - > EOF - Line: this is input - Line: some more input |