OSX terminal broken after trying to install cisco packet tracer - bash

Question

I tried to install cisco packet tracer on my mac. It was a sh script to install it. I ran it but not in su and it did some mess on my mac. After 1min i saw that my disk was full, since the script copied repertories everywhere.
Now, when i launch my terminal, the commands i recently installed (npm, brew, cordova...) are not recognized anymore, and there is not my user name at the beginning of the line, there is
-bash-3.2$
At every launch of the terminal, i get this error on the top of it :
Last login: Wed Jan 4 17:04:13 on ttys000
-bash: /etc/profile: line 1: syntax error near unexpected token `('
-bash: /etc/profile: line 1: `-e \n# System-wide .profile for sh(1)\n\nif [ -x /usr/libexec/path_helper ]; then\neval `/usr/libexec/path_helper -s`\nfi\n\nif [ "${BASH-no}" != "no" ]; then\n[ -r /etc/bashrc ] && . /etc/bashrc\nfi\nPT7HOME=/Users/myusername/Documents/pt'
I deleted the folder /Users/myusername/Documents/pt, but it seems that this is where the error is coming from. Thank you in advance for your help.

Answer 1

The error message implies that your /etc/profile, which by default looks like
# System-wide .profile for sh(1)
if [ -x /usr/libexec/path_helper ]; then
eval `/usr/libexec/path_helper -s`
fi
if [ "${BASH-no}" != "no" ]; then
[ -r /etc/bashrc ] && . /etc/bashrc
fi
was intended to be modified by adding a single line to the bottom
# System-wide .profile for sh(1)
if [ -x /usr/libexec/path_helper ]; then
eval `/usr/libexec/path_helper -s`
fi
if [ "${BASH-no}" != "no" ]; then
[ -r /etc/bashrc ] && . /etc/bashrc
fi
PT7HOME=/Users/myusername/Documents/pt
However, something went wrong, and in addition to adding a few extra characters to the beginning of the file, the indentation was removed and the newlines were converted to literal \n sequences, resulting in the contents becoming a single line, perhaps
-e \n# System-wide .profile for sh(1)\n\nif [ -x /usr/libexec/path_helper ]; then\neval `/usr/libexec/path_helper -s`\nfi\n\nif [ "${BASH-no}" != "no" ]; then\n[ -r /etc/bashrc ] && . /etc/bashrc\nfi\nPT7HOME=/Users/myusername/Documents/pt
Without further information, I would suggest that you could simply edit the file to look like the modified version above. However, #n.m.'s and #cdarke's suggestions should both be taken: restore from backup if possible, and contact user support to figure out what exactly may be wrong with the script.